org, ocda (ongoing) split file, separate functions

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+-*- mode: org -*-
+#+TITLE:       spine (doc_reform) object-centric document abstraction
+#+DESCRIPTION: documents - structuring, publishing in multiple formats & search
+#+FILETAGS:    :spine:abstraction:
+#+AUTHOR:      Ralph Amissah
+#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
+#+COPYRIGHT:   Copyright (C) 2015 - 2024 Ralph Amissah
+#+LANGUAGE:    en
+#+STARTUP:     content hideblocks hidestars noindent entitiespretty
+#+PROPERTY:    header-args  :noweb yes
+#+PROPERTY:    header-args+ :exports code
+#+PROPERTY:    header-args+ :results no
+#+PROPERTY:    header-args+ :cache no
+#+PROPERTY:    header-args+ :padline no
+#+PROPERTY:    header-args+ :mkdirp yes
+#+OPTIONS:     H:3 num:nil toc:t \n:t ::t |:t ^:nil -:t f:t *:t
+
+- [[./doc-reform.org][doc-reform.org]]  [[./][org/]]
+
+* (Object-Centric) Document Abstraction
+Process markup document, create document abstraction.
+
+** _module + templates_ :module:metadoc_from_src:
+
+#+HEADER: :tangle "../src/doc_reform/meta/metadoc_from_src_functions.d"
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+<<doc_header_including_copyright_and_license>>
+// document abstraction:
+// abstraction of sisu markup for downstream processing
+// metadoc_from_src.d
+module doc_reform.meta.metadoc_from_src_functions;
+template docAbstractionFunctions() {
+  <<docInitialize>>
+  <<docAbstractionRelatedFunctions>>
+}
+template docSectKeysSeq() {
+  <<docSectKeysSeq>>
+}
+#+END_SRC
+
+** template docAbstraction (related) Functions
+*** ocda initialize
+
+#+NAME: docInitialize
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ abstraction imports
+import
+  std.algorithm,
+  std.container,
+  std.file,
+  std.json,
+  std.path;
+import
+  doc_reform.meta,
+  doc_reform.meta.defaults,
+  doc_reform.meta.rgx,
+  doc_reform.meta.metadoc_object_setter,
+  doc_reform.meta.rgx;
+// ↓ abstraction mixins
+mixin ObjectSetter;
+mixin InternalMarkup;
+mixin spineRgxIn;
+static auto rgx = RgxI();
+// initialize
+string[string] an_object, processing, object_notes;
+string an_object_key;
+string[] anchor_tags;
+string anchor_tag;
+string anchor_tag_;
+string[string] tag_in_seg;
+string lev_anchor_tag;
+string[string][string] tag_assoc;
+string[] lv0to3_tags;
+// enum
+// biblio variables
+string biblio_tag_name, biblio_tag_entry, st;
+string[] biblio_arr_json;
+string biblio_entry_str_json;
+JSONValue[] bib_arr_json;
+int bib_entry;
+// counters
+int cntr, previous_count, previous_length;
+bool reset_note_numbers = true;
+int[string] line_occur;
+int html_segnames_ptr = 0;
+int html_segnames_ptr_cntr = 0;
+int verse_line, heading_ptr;
+// paragraph attributes
+int[string] indent;
+bool bullet = true;
+string content_non_header = "8";
+// ocn
+OCNset obj_cite_digits;
+int obj_cite_digit_, obj_cite_digit_off, obj_cite_digit_bkidx, obj_cite_digit_type;
+int[] dom_structure_markedup_tags_status         = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
+int[] dom_structure_markedup_tags_status_buffer  = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
+int[] dom_structure_collapsed_tags_status        = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
+int[] dom_structure_collapsed_tags_status_buffer = [ 0, 0, 0, 0, 0, 0, 0, 0, 0,];
+static auto obj_im = ObjInlineMarkup();
+static auto obj_att = ObjAttributes();
+auto object_citation_number = OCNemitter();
+auto node_construct = NodeStructureMetadata();
+#+END_SRC
+
+*** ocda functions
+**** ϝ [overview/index]
+
+#+NAME: docAbstractionRelatedFunctions
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ abstraction function emitters
+<<ocdaFunc_emitters>>
+// ↓ abstraction functions
+<<ocdaFunc_resets>>
+<<ocdaFunc_line_markup>>
+<<ocdaFunc_text_by_line>>
+<<ocdaFunc_para>>
+<<ocdaFunc_heading>>
+<<ocdaFunc_table>>
+<<ocdaFunc_block_line_empty>>
+<<ocdaFunc_obj_set>>
+<<ocdaFunc_obj_inline_munge>>
+<<ocdaFunc_obj_inline_markup>>
+<<ocdaFunc_obj_attributes>>
+<<ocdaFunc_obj_set_markup_level_tags>>
+<<ocdaFunc_section_toc>>
+<<ocdaFunc_section_endnotes>>
+<<ocdaFunc_section_book_index>>
+<<ocdaFunc_section_glossary>>
+<<ocdaFunc_section_bibliography>>
+<<ocdaFunc_section_blurb>>
+<<ocdaFunc_images>>
+<<ocdaFunc_links>>
+<<ocdaFunc_segnames>>
+<<ocdaFunc_structure_ancestors>>
+<<ocdaFunc_structure_descendants>>
+<<ocdaFunc_assertions>>
+#+END_SRC
+
+**** ϝ emitters
+
+#+NAME: ocdaFunc_emitters
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - emitters
+@safe pure struct OCNemitter {
+  int ocn_digit, ocn_object_number, ocn_on_, ocn_off_, ocn_bkidx, ocn_bkidx_;
+  string object_identifier;
+  bool ocn_is_off;
+  @safe auto ocn_emitter(int ocn_status_flag) {
+    OCNset ocn;
+    assert(ocn_status_flag <= eN.ocn.reset);
+    ocn_object_number              = ocn_bkidx = 0;
+    object_identifier              = "";
+    ocn_is_off                     = false;
+    switch(ocn_status_flag) with (eN.ocn) {
+    case reset:
+      ocn_digit                    = ocn_on_             = 1;
+      object_identifier            = "1";
+      ocn_is_off                   = false;
+      ocn_off_                     = ocn_bkidx_ = 0;
+      break;
+    case on:
+      ocn_digit                    = ocn_object_number   = ++ocn_on_;
+      object_identifier            = ocn_digit.to!string;
+      ocn_is_off                   = false;
+      break;
+    case off:
+      ocn_digit                    = 0;
+      ocn_off_                     = ++ocn_off_;
+      object_identifier            = "a" ~ ocn_off_.to!string;
+      ocn_is_off                   = true;
+      break;
+    case bkidx:
+      ocn_bkidx                    = ++ocn_bkidx_;
+      break;
+    case closing: // unused?
+      break;
+    default:
+      ocn_digit                    = 0;
+    }
+    assert(ocn_digit >= 0);
+    ocn.digit                      = ocn_digit;
+    ocn.object_number              = ocn_object_number; // difference between .object_number and .digit?
+    ocn.identifier                 = object_identifier;
+    ocn.off                        = ocn_is_off;
+    ocn.bkidx                      = ocn_bkidx;
+    ocn.type                       = ocn_status_flag;
+    return ocn;
+  }
+  invariant() {
+  }
+}
+@safe pure ObjGenericComposite obj_heading_ancestors()(
+  ObjGenericComposite  obj,
+  string[]             lv_ancestors_txt,
+) {
+  switch (obj.metainfo.heading_lev_markup) {
+  case 0:
+    lv_ancestors_txt[0] = obj.text.to!string;
+    foreach(k; 1..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 1:
+    lv_ancestors_txt[1] = obj.text.to!string;
+    foreach(k; 2..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 2:
+    lv_ancestors_txt[2] = obj.text.to!string;
+    foreach(k; 3..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 3:
+    lv_ancestors_txt[3] = obj.text.to!string;
+    foreach(k; 4..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 4:
+    lv_ancestors_txt[4] = obj.text.to!string;
+    foreach(k; 5..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 5:
+    lv_ancestors_txt[5] = obj.text.to!string;
+    foreach(k; 6..8) { lv_ancestors_txt[k] = ""; }
+    goto default;
+  case 6:
+    lv_ancestors_txt[6] = obj.text.to!string;
+    lv_ancestors_txt[7] = "";
+    goto default;
+  case 7:
+    lv_ancestors_txt[7] = obj.text.to!string;
+    goto default;
+  default:
+    obj.tags.heading_ancestors_text = lv_ancestors_txt.dup;
+  }
+  return obj;
+}
+@safe static  OCNset ocn_emit(int ocn_status_flag) {
+  return object_citation_number.ocn_emitter(ocn_status_flag);
+}
+@safe static uint[string] _check_ocn_status_()(
+  char[]       line,
+  uint[string] pith,
+) {
+  static auto rgx = RgxI();
+  if (!(line.empty)) {
+    if (pith["no_ocn_multiple_objects"] == eN.bi.off) {
+      // not multi-line object, check whether object_number is on or turned off
+      if (line.matchFirst(rgx.object_number_block_marks)) {                      // switch off object_number
+        if (line.matchFirst(rgx.object_number_off_block)) {
+          pith["no_ocn_multiple_objects"]             = eN.bi.on;
+          pith["ocn"]                                 = eN.ocn.off;
+          debug(ocnoff) { writeln(line); }
+        }
+        if (line.matchFirst(rgx.object_number_off_block_dummy_heading)) {
+          pith["no_ocn_multiple_objects"]             = eN.bi.on;
+          pith["dummy_heading_multiple_objects"]      = eN.bi.on;
+          pith["ocn"]                                 = eN.ocn.off;
+          debug(ocnoff) { writeln(line); }
+        }
+      } else if (pith["no_ocn_multiple_objects"] == eN.bi.off) {
+          pith["dummy_heading_status"]                = eN.bi.off;
+          if (pith["dummy_heading_multiple_objects"]) {
+            pith["dummy_heading_status"]              = eN.bi.on;
+          }
+          if (line.matchFirst(rgx.object_number_off)) {
+            pith["ocn"]                               = eN.ocn.off;
+          } else if (line.matchFirst(rgx.object_number_off_dummy_heading)) {
+            pith["ocn"]                               = eN.ocn.off;
+            pith["dummy_heading_status"]              = eN.bi.on;
+          } else {
+            pith["ocn"]                               = eN.ocn.on;
+            pith["dummy_heading_status"]              = eN.bi.off;
+          }
+        } else {
+          pith["ocn"] = pith["no_ocn_multiple_objects"];
+        }
+    } else if (pith["no_ocn_multiple_objects"] == eN.bi.on) {
+      if (line.matchFirst(rgx.object_number_off_block_close)) {
+        pith["no_ocn_multiple_objects"]               = eN.bi.off;
+        pith["ocn"]                                   = eN.ocn.on;
+        pith["dummy_heading_status"]                  = eN.bi.off;
+        debug(ocnoff) { writeln(line); }
+      }
+    }
+  }
+  return pith;
+}
+// ↑ - emitters ↑
+#+END_SRC
+
+**** ϝ resets (by line & object)
+
+#+NAME: ocdaFunc_resets
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - reset text by line
+@system ST_txt_by_line_common_reset txt_by_line_common_reset_()(
+  int[string]     line_occur,
+  string[string]  an_object,
+  uint[string]    pith,
+) {
+  line_occur["heading"]                               = eN.bi.off;
+  line_occur["para"]                                  = eN.bi.off;
+  pith["txt_is"]                                      = eN.txt_is.off;
+  an_object                                           = an_object.object_reset;
+  ST_txt_by_line_common_reset ret;
+  {
+    ret.line_occur  = line_occur;
+    ret.this_object = an_object;
+    ret.pith        = pith;
+  }
+  return ret;
+}
+// ↓ - reset object
+@safe static string[string] object_reset()(string[string] an_object) {
+  an_object.remove("body_nugget");
+  an_object.remove("substantive");
+  an_object.remove("is");
+  an_object.remove("attrib");
+  an_object.remove("bookindex_nugget");
+  return an_object;
+}
+// ↑ - resets
+#+END_SRC
+
+**** ϝ by line
+***** ϝ line markup
+
+#+NAME: ocdaFunc_line_markup
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - markup text by line
+@safe char[] font_faces_line()(char[] textline) {
+  static auto rgx = RgxI();
+  static auto mkup = InlineMarkup();
+  if (textline.match(rgx.inline_faces_line)) {
+    textline = textline
+      .replaceFirst(rgx.inline_emphasis_line,
+        format(q"┃%s%s%s%s%s%s%s┃",
+          mkup.ff_i, mkup.emph, mkup.ff_o, "$1", mkup.ff_c, mkup.emph, "$2"))
+      .replaceFirst(rgx.inline_bold_line,
+        format(q"┃%s%s%s%s%s%s%s┃",
+          mkup.ff_i, mkup.bold, mkup.ff_o, "$1", mkup.ff_c, mkup.bold, "$2"))
+      .replaceFirst(rgx.inline_underscore_line,
+        format(q"┃%s%s%s%s%s%s%s┃",
+          mkup.ff_i, mkup.underscore, mkup.ff_o, "$1", mkup.ff_c, mkup.underscore, "$2"))
+      .replaceFirst(rgx.inline_italics_line,
+        format(q"┃%s%s%s%s%s%s%s┃",
+          mkup.ff_i, mkup.italic,  mkup.ff_o, "$1", mkup.ff_c, mkup.italic, "$2"));
+  }
+  return textline;
+}
+@safe auto inline_markup_faces(L)(L line) {
+  static auto rgx = RgxI();
+  static auto mkup = InlineMarkup();
+  line = replaceAll!(m => mkup.quote_o ~ m[1] ~ mkup.quote_c)(line, rgx.within_quotes);
+  line = replaceAll!(m => mkup.ff_i ~ mkup.mono ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ mkup.mono)(line, rgx.inline_mark_mono);
+  line = replaceAll!(m => mkup.ff_i ~ mkup.cite ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ mkup.cite)(line, rgx.inline_mark_cite);
+  foreach (regx; [rgx.inline_mark_emphasis, rgx.inline_mark_bold, rgx.inline_mark_underscore, rgx.inline_mark_italics, rgx.inline_mark_superscript, rgx.inline_mark_subscript, rgx.inline_mark_strike, rgx.inline_mark_insert]) {
+    line = replaceAll!(m => mkup.ff_i ~ m["mark"] ~ mkup.ff_o ~ m["text"] ~ mkup.ff_c ~ m["mark"])(line, regx);
+  }
+  return line;
+}
+@safe static string links_and_images()(string obj_txt) {
+  static auto rgx = RgxI();
+  static auto mkup = InlineMarkup();
+  if (obj_txt.match(rgx.smid_inline_url_generic)) {
+    if (
+      obj_txt.match(rgx.smid_inline_link_endnote_url_helper)
+      || obj_txt.match(rgx.smid_inline_link_endnote_url_helper_punctuated)
+    ) {
+      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s %s%s%s%s%s%s %s%s",
+        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c,
+        mkup.en_a_o,
+        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c,
+        mkup.en_a_c,
+        m[3]
+      ))(obj_txt, rgx.smid_inline_link_endnote_url_helper_punctuated);
+      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s %s%s%s%s%s%s %s",
+        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c,
+        mkup.en_a_o,
+        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c,
+        mkup.en_a_c
+      ))(obj_txt, rgx.smid_inline_link_endnote_url_helper);
+  } else {
+      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s",
+        m["pre"],
+        mkup.lnk_o, m["content"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c
+      ))(obj_txt, rgx.smid_inline_link_markup_regular);
+    }
+      obj_txt = replaceAll!(m => format("%s%s%s%s%s%s%s",
+        m["pre"],
+        mkup.lnk_o, m["link"].strip, mkup.lnk_c,
+        mkup.url_o, m["link"], mkup.url_c
+      ))(obj_txt, rgx.smid_inline_link_naked_url); //
+  }
+  return obj_txt;
+}
+@safe char[] _doc_header_and_make_substitutions_(CMM)(
+  char[]  line,
+  CMM     conf_make_meta,
+) {
+  enum Substitute { match, markup, }
+  if (conf_make_meta.make.substitute) {
+    foreach(substitution_pair; conf_make_meta.make.substitute) {
+      line = line.replaceAll(
+        regex("\b" ~ substitution_pair[Substitute.match]),
+        substitution_pair[Substitute.markup]
+      );
+    }
+  }
+  return line;
+}
+@safe char[] _doc_header_and_make_substitutions_fontface_(CMM)(
+  char[]  line,
+  CMM     conf_make_meta,
+) {
+  enum Substitute { match, markup, }
+  if ( conf_make_meta.make.bold) {
+    line = line.replaceAll(
+      regex("\b" ~ conf_make_meta.make.bold[Substitute.match]),
+      conf_make_meta.make.bold[Substitute.markup]
+    );
+  }
+  if (conf_make_meta.make.emphasis) {
+    line = line.replaceAll(
+      regex("\b" ~ conf_make_meta.make.emphasis[Substitute.match]),
+      conf_make_meta.make.emphasis[Substitute.markup]
+    );
+  }
+  if (conf_make_meta.make.italics) {
+    line = line.replaceAll(
+      regex("\b" ~ conf_make_meta.make.italics[Substitute.match]),
+      conf_make_meta.make.italics[Substitute.markup]
+    );
+  }
+  return line;
+}
+// ↑ - markup by line
+#+END_SRC
+
+***** ϝ para
+
+#+NAME: ocdaFunc_para
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - para
+@safe string[string][string] inline_para_link_anchor()(
+  string[string]          an_object,
+  string[string]          tag_in_seg,
+  string[string][string]  tag_assoc
+) {
+  static auto rgx = RgxI();
+  if (auto m = an_object["substantive"].match(rgx.inline_link_anchor)) {
+    if (m.captures[1] !in tag_assoc) {
+      tag_assoc[(m.captures[1])]["seg_lv4"]    = tag_in_seg["seg_lv4"];
+      tag_assoc[(m.captures[1])]["seg_lv1to4"] = tag_in_seg["seg_lv1to4"];
+    } else {
+      writeln("a tag named  already exists, check text line\n    ", an_object["substantive"]);
+    }
+  }
+  return tag_assoc;
+}
+@safe ST_flow_para_match flow_para_match_()(
+  char[]         line,
+  string[string]  an_object,
+  string          an_object_key,
+  int[string]     indent,
+  bool            bullet,
+  uint[string]    pith,
+  int[string]     line_occur,
+) {
+  static auto rgx = RgxI();
+  if (line_occur["para"] == eN.bi.off) {
+    line = font_faces_line(line);
+    // para matches
+    pith["txt_is"]           = eN.txt_is.para;
+    an_object[an_object_key] ~= line;
+    indent = [
+      "hang_position" : 0,
+      "base_position" : 0,
+    ];
+    bullet = false;
+    if (auto m = line.matchFirst(rgx.para_indent)) {
+      debug(paraindent) { writeln(line); }
+      indent["hang_position"] = (m["indent"]).to!int;
+      indent["base_position"] = (m["indent"]).to!int;
+    } else if (line.matchFirst(rgx.para_bullet)) {
+      debug(parabullet) { writeln(line); }
+      bullet = true;
+    } else if (auto m = line.matchFirst(rgx.para_indent_hang)) {
+      debug(paraindenthang) { writeln(line); }
+      indent = [
+        "hang_position" : (m["hang"]).to!int,
+        "base_position" : (m["indent"]).to!int,
+      ];
+    } else if (auto m = line.matchFirst(rgx.para_bullet_indent)) {
+      debug(parabulletindent) { writeln(line); }
+      indent = [
+        "hang_position" : (m["indent"]).to!int,
+        "base_position" : (m["indent"]).to!int,
+      ];
+      bullet = true;
+    }
+    ++line_occur["para"];
+  }
+  ST_flow_para_match ret;
+  {
+    ret.pith            = pith;
+    ret.this_object     = an_object;
+    ret.this_object_key = an_object_key;
+    ret.indent          = indent;
+    ret.bullet          = bullet;
+    ret.line_occur      = line_occur;
+  }
+  return ret;
+}
+// ↑ - para
+#+END_SRC
+
+***** ϝ heading
+
+#+NAME: ocdaFunc_heading
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - heading
+@safe ST_flow_heading_found flow_heading_found_()(
+  char[]                line,
+  string[string]        heading_match_str,
+  string[]              _make_unmarked_headings,
+  Regex!(char)[string]  heading_match_rgx,
+  uint[string]          pith,
+) {
+  static auto rgx = RgxI();
+  if ((_make_unmarked_headings.length > 2)
+  && (pith["make_headings"] == eN.bi.off)) {                        // headings found
+    debug(headingsfound) { writeln(_make_unmarked_headings); }
+    debug(headingsfound) {
+      writeln(_make_unmarked_headings.length);
+      writeln(_make_unmarked_headings);
+    }
+    switch (_make_unmarked_headings.length) {
+    case 7 :
+      if (!empty(_make_unmarked_headings[6])) {
+        heading_match_str["h_4"]
+          = "^(" ~ _make_unmarked_headings[6].to!string ~ ")";
+        heading_match_rgx["h_4"]
+          = regex(heading_match_str["h_4"]);
+      }
+      goto case;
+    case 6 :
+      if (!empty(_make_unmarked_headings[5])) {
+        heading_match_str["h_3"]
+          = "^(" ~ _make_unmarked_headings[5].to!string ~ ")";
+        heading_match_rgx["h_3"]
+          = regex(heading_match_str["h_3"]);
+      }
+      goto case;
+    case 5 :
+      if (!empty(_make_unmarked_headings[4])) {
+        heading_match_str["h_2"]
+          = "^(" ~ _make_unmarked_headings[4].to!string ~ ")";
+        heading_match_rgx["h_2"]
+          = regex(heading_match_str["h_2"]);
+      }
+      goto case;
+    case 4 :
+      if (!empty(_make_unmarked_headings[3])) {
+        heading_match_str["h_1"]
+          = "^(" ~ _make_unmarked_headings[3].to!string ~ ")";
+        heading_match_rgx["h_1"]
+          = regex(heading_match_str["h_1"]);
+      }
+      goto case;
+    case 3 :
+      if (!empty(_make_unmarked_headings[2])) {
+        heading_match_str["h_D"]
+          = "^(" ~ _make_unmarked_headings[2].to!string ~ ")";
+        heading_match_rgx["h_D"]
+          = regex(heading_match_str["h_D"]);
+      }
+      goto case;
+    case 2 :
+      if (!empty(_make_unmarked_headings[1])) {
+        heading_match_str["h_C"]
+          = "^(" ~ _make_unmarked_headings[1].to!string ~ ")";
+        heading_match_rgx["h_C"]
+          = regex(heading_match_str["h_C"]);
+      }
+      goto case;
+    case 1 :
+      if (!empty(_make_unmarked_headings[0])) {
+        heading_match_str["h_B"]
+          = "^(" ~ _make_unmarked_headings[0].to!string ~ ")";
+        heading_match_rgx["h_B"]
+          = regex(heading_match_str["h_B"]);
+      }
+      break;
+    default:
+      break;
+    }
+    pith["make_headings"] = eN.bi.on;
+  }
+  ST_flow_heading_found ret;
+  {
+    ret.heading_match_str = heading_match_str;
+    ret.heading_match_rgx = heading_match_rgx;
+    ret.pith              = pith;
+  }
+  return ret;
+}
+@safe ST_flow_heading_make_set flow_heading_make_set_()(
+             char[]                line,
+             int[string]           line_occur,
+  return ref Regex!(char)[string]  heading_match_rgx,
+  return ref uint[string]          pith,
+) {
+  if (pith["make_headings"] == eN.bi.on
+    && (line_occur["para"] == eN.bi.off
+    && line_occur["heading"] == eN.bi.off)
+    && pith["txt_is"] == eN.txt_is.off
+  ) {                             // heading make set
+    if (line.matchFirst(heading_match_rgx["h_B"])) {
+      line = "B~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_C"])) {
+      line = "C~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_D"])) {
+      line = "D~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_1"])) {
+      line = "1~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_2"])) {
+      line = "2~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_3"])) {
+      line = "3~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+    if (line.matchFirst(heading_match_rgx["h_4"])) {
+      line = "4~ " ~ line;
+      debug(headingsfound) { writeln(line); }
+    }
+  }
+  ST_flow_heading_make_set ret;
+  {
+    ret.line           = line;
+    ret.pith           = pith;
+    ret.this_object    = an_object;
+  }
+  return ret;
+}
+@safe auto flow_heading_matched_(CMM)(
+  char[]          line,
+  string[string]  an_object,
+  int[string]     line_occur,
+  string          an_object_key,
+  int[string]     lv,
+  int[string]     collapsed_lev,
+  uint[string]    pith,
+  CMM             conf_make_meta,
+) {
+  static auto rgx = RgxI();
+  static auto mkup = InlineMarkup();
+  if (auto m = line.match(rgx.headings)) {                                      // heading match
+    ++line_occur["heading"];
+    pith["txt_is"]           = eN.txt_is.heading;
+    if (line.match(rgx.heading_seg_and_above)) {
+      pith["section"]        = eN.sect.unset;
+    }
+    an_object[an_object_key] ~= line ~= "\n";
+    an_object["lev"] ~= m.captures[1];
+    assertions_doc_structure(an_object, an_object_key, lv); // includes most of the logic for collapsed levels
+    switch (an_object["lev"]) {
+    case "A":                                // Title set
+      if ((an_object[an_object_key].match(rgx.variable_doc_title_author_date))
+      || (an_object[an_object_key].match(rgx.variable_doc_title)
+      && an_object[an_object_key].match(rgx.variable_doc_author)
+      && an_object[an_object_key].match(rgx.variable_doc_date))) {
+        an_object[an_object_key] = an_object[an_object_key]
+          .replaceFirst(rgx.variable_doc_title_author_date,
+            (conf_make_meta.meta.title_full
+            ~ mkup.br_line_inline
+            ~ conf_make_meta.meta.creator_author
+            ~ " (" ~ (conf_make_meta.meta.date_published.replaceFirst(regex(r"(?:-00)+"),"")) ~ ")"))
+          .replaceFirst(rgx.variable_doc_title,
+            (conf_make_meta.meta.title_full ~ mkup.br_line_inline))
+          .replaceFirst(rgx.variable_doc_author,
+            conf_make_meta.meta.creator_author)
+          .replaceFirst(rgx.variable_doc_date,
+            " (" ~ (conf_make_meta.meta.date_published.replaceFirst(regex(r"(?:-00)+"),"")) ~ ")");
+      } else if ((an_object[an_object_key].match(rgx.variable_doc_title_author))
+      || (an_object[an_object_key].match(rgx.variable_doc_title)
+      && an_object[an_object_key].match(rgx.variable_doc_author))) {
+        an_object[an_object_key] = an_object[an_object_key]
+          .replaceFirst(rgx.variable_doc_title_author_date,
+            (conf_make_meta.meta.title_full
+            ~ mkup.br_line_inline
+            ~ conf_make_meta.meta.creator_author))
+          .replaceFirst(rgx.variable_doc_title,
+            (conf_make_meta.meta.title_full ~ mkup.br_line_inline))
+          .replaceFirst(rgx.variable_doc_author,
+            conf_make_meta.meta.creator_author);
+      } else if (an_object[an_object_key].match(rgx.variable_doc_title)) {
+        an_object[an_object_key] = an_object[an_object_key]
+          .replaceFirst(rgx.variable_doc_title,
+            conf_make_meta.meta.title_full);
+      }
+      collapsed_lev["h0"] = 0;
+      an_object["lev_collapsed_number"]
+        = collapsed_lev["h0"].to!string;
+      lv["lv"] = DocStructMarkupHeading.h_sect_A;
+      ++lv["h0"];
+      lv["h1"] = eN.bi.off;
+      lv["h2"] = eN.bi.off;
+      lv["h3"] = eN.bi.off;
+      lv["h4"] = eN.bi.off;
+      lv["h5"] = eN.bi.off;
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "B":
+      collapsed_lev["h1"] = collapsed_lev["h0"] + 1;
+      an_object["lev_collapsed_number"]
+        = collapsed_lev["h1"].to!string;
+      lv["lv"] = DocStructMarkupHeading.h_sect_B;
+      ++lv["h1"];
+      lv["h2"] = eN.bi.off;
+      lv["h3"] = eN.bi.off;
+      lv["h4"] = eN.bi.off;
+      lv["h5"] = eN.bi.off;
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "C":
+      collapsed_lev["h2"] = collapsed_lev["h1"] + 1;
+      an_object["lev_collapsed_number"]
+        = collapsed_lev["h2"].to!string;
+      lv["lv"] = DocStructMarkupHeading.h_sect_C;
+      ++lv["h2"];
+      lv["h3"] = eN.bi.off;
+      lv["h4"] = eN.bi.off;
+      lv["h5"] = eN.bi.off;
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "D":
+      collapsed_lev["h3"] = collapsed_lev["h2"] + 1;
+      an_object["lev_collapsed_number"]
+        = collapsed_lev["h3"].to!string;
+      lv["lv"] = DocStructMarkupHeading.h_sect_D;
+      ++lv["h3"];
+      lv["h4"] = eN.bi.off;
+      lv["h5"] = eN.bi.off;
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "1":
+      if (lv["h3"] > eN.bi.off) {
+        collapsed_lev["h4"] = collapsed_lev["h3"] + 1;
+      } else if (lv["h2"] > eN.bi.off) {
+        collapsed_lev["h4"] = collapsed_lev["h2"] + 1;
+      } else if (lv["h1"] > eN.bi.off) {
+        collapsed_lev["h4"] = collapsed_lev["h1"] + 1;
+      } else if (lv["h0"] > eN.bi.off) {
+        collapsed_lev["h4"] = collapsed_lev["h0"] + 1;
+      }
+      an_object["lev_collapsed_number"]
+        = collapsed_lev["h4"].to!string;
+      lv["lv"] = DocStructMarkupHeading.h_text_1;
+      ++lv["h4"];
+      lv["h5"] = eN.bi.off;
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "2":
+      if (lv["h5"] > eN.bi.off) {
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h5"].to!string;
+      } else if (lv["h4"] > eN.bi.off) {
+        collapsed_lev["h5"] = collapsed_lev["h4"] + 1;
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h5"].to!string;
+      }
+      lv["lv"] = DocStructMarkupHeading.h_text_2;
+      ++lv["h5"];
+      lv["h6"] = eN.bi.off;
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "3":
+      if (lv["h6"] > eN.bi.off) {
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h6"].to!string;
+      } else if (lv["h5"] > eN.bi.off) {
+        collapsed_lev["h6"] = collapsed_lev["h5"] + 1;
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h6"].to!string;
+      }
+      lv["lv"] = DocStructMarkupHeading.h_text_3;
+      ++lv["h6"];
+      lv["h7"] = eN.bi.off;
+      goto default;
+    case "4":
+      if (lv["h7"] > eN.bi.off) {
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h7"].to!string;
+      } else if (lv["h6"] > eN.bi.off) {
+        collapsed_lev["h7"] = collapsed_lev["h6"] + 1;
+        an_object["lev_collapsed_number"]
+          = collapsed_lev["h7"].to!string;
+      }
+      lv["lv"] = DocStructMarkupHeading.h_text_4;
+      ++lv["h7"];
+      goto default;
+    default:
+      an_object["lev_markup_number"] = lv["lv"].to!string;
+    }
+    an_object["dummy_heading_status"] = (pith["dummy_heading_status"] == eN.bi.off) ? "f" : "t";
+    debug(heading) { writeln(line.strip); }
+  }
+  struct ST_flow_heading_matched {
+    string[string]  this_object;
+    int[string]     line_occur;
+    string          an_object_key;
+    int[string]     lv;
+    int[string]     collapsed_lev;
+    uint[string]    pith;
+    CMM             conf_make_meta;
+  }
+  ST_flow_heading_matched ret;
+  {
+    ret.this_object    = an_object;
+    ret.line_occur     = line_occur;
+    ret.an_object_key  = an_object_key;
+    ret.lv             = lv;
+    ret.collapsed_lev  = collapsed_lev;
+    ret.pith           = pith;
+    ret.conf_make_meta = conf_make_meta;
+  }
+  return ret;
+}
+// ↑ - heading
+#+END_SRC
+
+***** ϝ table
+
+#+NAME: ocdaFunc_table
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - table
+@safe ObjGenericComposite flow_table_instructions(H)(
+  ObjGenericComposite  table_object,
+  H                    table_head,
+) {
+  static auto rgx = RgxI();
+  table_object.metainfo.is_of_part        = "body";
+  table_object.metainfo.is_of_section     = "body";
+  table_object.metainfo.is_of_type        = "block";
+  table_object.metainfo.is_a              = "table";
+  table_object.has.inline_notes_reg       = false;
+  table_object.has.inline_notes_star      = false;
+  table_object.has.inline_links           = false;
+  if (auto m = table_head.matchFirst(rgx.table_head_instructions)) {
+    table_object.table.heading
+      = ((m["c_heading"].length > 0) && (m["c_heading"] == "h")) ? true : false;
+    table_object.table.number_of_columns
+      = ((m["c_num"].length > 0) && (m["c_num"].to!int > 0)) ? m["c_num"].to!int : 0;
+    foreach (cw; m["c_widths"].matchAll(rgx.table_col_widths)) {
+      auto x = cw.hit.matchFirst(rgx.table_col_widths_and_alignment);
+      table_object.table.column_widths ~= x["width"].to!int;
+      table_object.table.column_aligns ~= (x["align"].empty) ? "" : x["align"];
+    }
+  }
+  return table_object;
+}
+@safe ST_flow_table_array_munge flow_table_array_munge()(
+  ObjGenericComposite  table_object,
+  string[][]           table_array,
+) {
+  static auto rgx = RgxI();
+  static auto mng = InlineMarkup();
+  string _table_substantive;
+  ulong col_num;
+  ulong col_num_;
+  ulong col_num_chk = 0;
+  foreach(idx_r, row; table_array) {
+    debug(table_dev) { writeln("row ", idx_r); }
+    col_num_ = 0;
+    if (col_num == 0
+    || col_num < row.length) {
+      col_num = row.length;
+    }
+    if (col_num_chk == 0) {
+      col_num_chk = col_num;
+    } else if (col_num == 1) {
+      debug(table_dev) { writeln("table note: "); }
+    } else if (col_num_chk != col_num) {
+      debug(table_dev) { writeln("warning irregular number of columns: ", col_num_chk, " != ", col_num); }
+    } else {
+    }
+    foreach(idx_c, col; row) {
+      debug(table_dev) { write(idx_c, ", "); }
+      col_num_ = idx_c;
+      _table_substantive ~= col ~ mng.tc_s;
+      if (idx_r == 0 && table_object.table.heading) {
+      } else if (col.match(rgx.numeric_col) && idx_r == 1) { // conditions reversed to avoid: gdc compiled program run segfault
+        if ((table_object.table.column_aligns.length > idx_c)
+        && (table_object.table.column_aligns[idx_c].matchFirst(rgx.table_col_align_match))) {
+          table_object.table.column_aligns[idx_c] = table_object.table.column_aligns[idx_c];
+        } else if (table_object.table.column_aligns.length > idx_c) {
+          table_object.table.column_aligns[idx_c] = "r";
+        } else {
+          table_object.table.column_aligns ~= "r";
+        }
+      } else if (idx_r == 1) {
+        if ((table_object.table.column_aligns.length > idx_c)
+        && (table_object.table.column_aligns[idx_c].matchFirst(rgx.table_col_align_match))) {
+          table_object.table.column_aligns[idx_c] = table_object.table.column_aligns[idx_c];
+        } else if (table_object.table.column_aligns.length > idx_c) {
+          table_object.table.column_aligns[idx_c] = "l";
+        } else {
+          table_object.table.column_aligns ~= "l";
+        }
+      }
+    }
+    debug(table_dev) { writeln(""); }
+    if (col_num_chk > 0 && (col_num != col_num_chk)) {
+    } else if (col_num == col_num_chk){
+    } else {
+      col_num_chk = col_num;
+    }
+    _table_substantive = _table_substantive.replaceFirst(rgx.table_col_separator_nl, "\n");
+  }
+  if (table_object.table.number_of_columns != col_num) {
+    if (table_object.table.number_of_columns == 0) {
+      table_object.table.number_of_columns = (col_num).to!int;
+    } else {
+      debug(table_dev) { writeln(table_object.table.number_of_columns, " != ", col_num); }
+    }
+  }
+  if (table_object.table.number_of_columns == 0
+  && table_object.table.column_widths.length > 0) {
+    writeln(__LINE__, " ERROR");
+  }
+  if (table_object.table.number_of_columns > 0
+  && table_object.table.column_widths.length == 0) {
+    double col_w = (100.00 / table_object.table.number_of_columns);
+    foreach (i; 0..table_object.table.number_of_columns) {
+      table_object.table.column_widths ~= col_w;
+    }
+  } else if (table_object.table.number_of_columns
+  != table_object.table.column_widths.length) {
+    debug(table_dev) { writeln(m.hit); } // further logic required
+    if (table_object.table.number_of_columns > table_object.table.column_widths.length) {
+      double col_w = (100.00 - (table_object.table.column_widths).sum)
+        / (table_object.table.number_of_columns - table_object.table.column_widths.length);
+      foreach (i; 0..table_object.table.column_widths.length) {
+        table_object.table.column_widths ~= col_w;
+      }
+      foreach (i; 0..(table_object.table.number_of_columns - table_object.table.column_widths.length)) {
+        table_object.table.column_widths ~= col_w;
+      }
+    } else if (table_object.table.number_of_columns < table_object.table.column_widths.length) {
+      writeln(__LINE__, " warning, ERROR");
+    }
+  }
+  if (table_object.table.column_widths.sum > 101
+  || table_object.table.column_widths.sum < 95 ) {
+    writeln("sum: ", table_object.table.column_widths.sum,
+      ", array: ", table_object.table.column_widths,
+      ", cols: ", table_object.table.number_of_columns);
+    writeln(_table_substantive);
+  }
+  debug(table_res) {
+    writeln("aligns: ", table_object.table.column_aligns, "\n",
+      "no. of columns: ", table_object.table.number_of_columns, "\n",
+      "col widths: ", table_object.table.column_widths,
+        " sum: ", table_object.table.column_widths.sum, "\n",
+      _table_substantive);
+  }
+  table_object.text = _table_substantive;
+  ST_flow_table_array_munge ret;
+  {
+    ret.table_object      = table_object;
+    ret.table_array       = table_array;
+  }
+  return ret;
+}
+@system ST_flow_table_substantive_munge flow_table_substantive_munge()(
+  ObjGenericComposite  table_object,
+  string               table_substantive,
+) {
+  static auto rgx = RgxI();
+  static auto munge = ObjInlineMarkupMunge();
+  string[] _table_rows = (table_substantive).split(rgx.table_row_delimiter);
+  string[] _table_cols;
+  string[][] _table_array;
+  foreach(col; _table_rows) {
+    _table_cols = col.split(rgx.table_col_delimiter);
+    _table_array ~= _table_cols;
+  }
+  {
+    auto _get = table_object.flow_table_array_munge(_table_array);
+    {
+      table_object = _get.table_object;
+      _table_array = _get.table_array; // what do you do with this? how is this passed down?
+    }
+  }
+  ST_flow_table_substantive_munge ret;
+  {
+    ret.table_object      = table_object;
+    ret.table_substantive = table_substantive; // has anything been changed here?
+  }
+  return ret;
+}
+@system ST_flow_table_substantive_munge flow_table_substantive_munge_special()(
+  ObjGenericComposite  table_object,
+  string               table_substantive,
+) {
+  static auto rgx = RgxI();
+  static auto munge = ObjInlineMarkupMunge();
+  string[] _table_rows = (table_substantive).split(rgx.table_row_delimiter_special);
+  string[] _table_cols;
+  string[][] _table_array;
+  foreach(col; _table_rows) {
+    _table_cols = col.split(rgx.table_col_delimiter_special);
+    _table_array ~= _table_cols;
+  }
+  {
+    auto _get = table_object.flow_table_array_munge(_table_array);
+    {
+      table_object = _get.table_object;
+      _table_array = _get.table_array;
+    }
+  }
+  ST_flow_table_substantive_munge ret;
+  {
+    ret.table_object      = table_object;
+    ret.table_substantive = table_substantive;
+  }
+  return ret;
+}
+@system ST_flow_table_closed_make_special_notation_table flow_table_closed_make_special_notation_table_(CMM)(
+  char[]                line,
+  string[string]        an_object,
+  ObjGenericComposite[] the_document_body_section,
+  OCNset                obj_cite_digits,
+  ObjGenericComposite   comp_obj_,
+  int                   cntr,
+  uint[string]          pith,
+  CMM                   conf_make_meta
+) {
+  comp_obj_       = comp_obj_.init;
+  obj_cite_digits = ocn_emit(pith["ocn"]);
+  auto comp_obj_location = node_construct.node_location_emitter(
+      content_non_header,
+      tag_in_seg,
+      lev_anchor_tag,
+      tag_assoc,
+      obj_cite_digits,
+      cntr,
+      heading_ptr-1,
+      "table"
+    );
+  an_object["is"]                                             = "table";
+  ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+    = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, "body_nugget", conf_make_meta, No._new_doc);
+  an_object["substantive"]                                    = substantive_obj_misc_struct.obj_txt;
+  comp_obj_.metainfo.ocn                                      = obj_cite_digits.object_number;
+  comp_obj_.metainfo.identifier                               = obj_cite_digits.identifier;
+  comp_obj_.metainfo.object_number_off                        = obj_cite_digits.off;
+  comp_obj_.tags.html_segment_anchor_tag_is                   = tag_in_seg["seg_lv4"];
+  comp_obj_.tags.epub_segment_anchor_tag_is                   = tag_in_seg["seg_lv1to4"];
+  comp_obj_.metainfo.o_n_book_index                           = obj_cite_digits.bkidx;
+  comp_obj_.metainfo.object_number_type                       = obj_cite_digits.type;
+  comp_obj_                                                   = comp_obj_.flow_table_instructions(an_object["table_head"]);
+  {
+    auto _get = comp_obj_.flow_table_substantive_munge_special(an_object["substantive"]);
+    {
+      comp_obj_           = _get.table_object;
+      an_object["substantive"] = _get.table_substantive;
+    }
+  }
+  the_document_body_section                                   ~= comp_obj_;
+  object_reset(an_object);
+  processing.remove("verse");
+  ++cntr;
+  ST_flow_table_closed_make_special_notation_table ret;
+  {
+    ret.this_object               = an_object;
+    ret.the_document_body_section = the_document_body_section;
+    ret.obj_cite_digits           = obj_cite_digits;
+    ret.comp_obj_                 = comp_obj_;
+    ret.cntr                      = cntr;
+    ret.pith                      = pith;
+  }
+  return ret;
+}
+// ↑ - table
+#+END_SRC
+
+***** ϝ block line empty
+
+#+NAME: ocdaFunc_block_line_empty
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+
+@system ST_flow_block_flag_line_empty flow_block_flag_line_empty_(B,CMM,Ts)(
+  char[]                   line,
+  string[string]           an_object,
+  B                        bookindex_extract_hash,
+  ObjGenericComposite[]    the_document_body_section,
+  string[][string][string] bookindex_unordered_hashes,
+  OCNset                   obj_cite_digits,
+  ObjGenericComposite      comp_obj_,
+  int                      cntr,
+  uint[string]             pith,
+  string[string]           object_number_poem,
+  CMM                      conf_make_meta,
+  Ts                       tag_in_seg,
+) {
+  assert(
+    line.empty,
+    "\nline should be empty:\n  \""
+    ~ line ~ "\""
+  );
+  assert(
+    (pith["block_state"] == eN.blk_state.closing),
+    "code block status: closed"
+  );
+  static auto rgx = RgxI();
+  if (pith["block_state"] == eN.blk_state.closing) {
+    if (pith["block_is"] == eN.blk_is.quote) {
+      obj_cite_digits = ocn_emit(pith["ocn"]);
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "quote";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+        = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+      an_object["substantive"]                                = substantive_obj_misc_struct.obj_txt;
+      anchor_tag                                              = substantive_obj_misc_struct.anchor_tag;
+      comp_obj_                                               = set_object_generic("body", "body", "block", "quote", an_object["substantive"], obj_cite_digits.object_number);
+      comp_obj_.metainfo.identifier                           = obj_cite_digits.identifier;
+      comp_obj_.metainfo.object_number_off                    = obj_cite_digits.off;
+      comp_obj_.metainfo.o_n_book_index                       = obj_cite_digits.bkidx;
+      comp_obj_.metainfo.object_number_type                   = obj_cite_digit_type;
+      comp_obj_.metainfo.lang                                 = an_object["lang"];
+      comp_obj_.metainfo.attrib                               = an_object["attrib"];
+      comp_obj_.tags.html_segment_anchor_tag_is               = tag_in_seg["seg_lv4"];
+      comp_obj_.tags.epub_segment_anchor_tag_is               = tag_in_seg["seg_lv1to4"];
+      comp_obj_.has.inline_notes_reg                          = substantive_obj_misc_struct.has_notes_reg;
+      comp_obj_.has.inline_notes_star                         = substantive_obj_misc_struct.has_notes_star;
+      comp_obj_.has.inline_links                              = substantive_obj_misc_struct.has_links;
+      the_document_body_section                               ~= comp_obj_;
+      tag_assoc                                               = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+      pith["block_is"]                                        = eN.blk_is.quote;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+      ++cntr;
+    } else if (pith["block_is"] == eN.blk_is.group) {
+      obj_cite_digits = ocn_emit(pith["ocn"]);
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "group";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+        = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+      an_object["substantive"]                                = substantive_obj_misc_struct.obj_txt;
+      anchor_tag                                              = substantive_obj_misc_struct.anchor_tag;
+      comp_obj_                                               = set_object_generic("body", "body", "block", "group", an_object["substantive"], obj_cite_digits.object_number);
+      comp_obj_.metainfo.identifier                           = obj_cite_digits.identifier;
+      comp_obj_.metainfo.object_number_off                    = obj_cite_digits.off;
+      comp_obj_.metainfo.o_n_book_index                       = obj_cite_digits.bkidx;
+      comp_obj_.metainfo.object_number_type                   = obj_cite_digits.type;
+      comp_obj_.metainfo.lang                                 = an_object["lang"];
+      comp_obj_.metainfo.attrib                               = an_object["attrib"];
+      comp_obj_.tags.html_segment_anchor_tag_is               = tag_in_seg["seg_lv4"];
+      comp_obj_.tags.epub_segment_anchor_tag_is               = tag_in_seg["seg_lv1to4"];
+      comp_obj_.has.inline_notes_reg                          = substantive_obj_misc_struct.has_notes_reg;
+      comp_obj_.has.inline_notes_star                         = substantive_obj_misc_struct.has_notes_star;
+      comp_obj_.has.inline_links                              = substantive_obj_misc_struct.has_links;
+      the_document_body_section                               ~= comp_obj_;
+      tag_assoc                                               = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+      pith["block_is"]                                        = eN.blk_is.poem;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+      ++cntr;
+    } else if (pith["block_is"] == eN.blk_is.block) {
+      obj_cite_digits = ocn_emit(pith["ocn"]);
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "block";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+        = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+      an_object["substantive"]                                = substantive_obj_misc_struct.obj_txt;
+      // anchor_tag                                           = substantive_obj_misc_struct.anchor_tag; // check
+      comp_obj_                                               = set_object_generic("body", "body", "block", "block", an_object["substantive"], obj_cite_digits.object_number);
+      comp_obj_.metainfo.identifier                           = obj_cite_digits.identifier;
+      comp_obj_.metainfo.object_number_off                    = obj_cite_digits.off;
+      comp_obj_.metainfo.o_n_book_index                       = obj_cite_digits.bkidx;
+      comp_obj_.metainfo.object_number_type                   = obj_cite_digit_type;
+      comp_obj_.metainfo.lang                                 = an_object["lang"];
+      comp_obj_.metainfo.attrib                               = an_object["attrib"];
+      comp_obj_.tags.html_segment_anchor_tag_is               = tag_in_seg["seg_lv4"];
+      comp_obj_.tags.epub_segment_anchor_tag_is               = tag_in_seg["seg_lv1to4"];
+      comp_obj_.has.inline_notes_reg                          = substantive_obj_misc_struct.has_notes_reg;
+      comp_obj_.has.inline_notes_star                         = substantive_obj_misc_struct.has_notes_star;
+      comp_obj_.has.inline_links                              = substantive_obj_misc_struct.has_links;
+      the_document_body_section                               ~= comp_obj_;
+      pith["block_is"]                                        = eN.blk_is.block;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+      ++cntr;
+    } else if (pith["block_is"] == eN.blk_is.poem) {
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "verse";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      comp_obj_poem_ocn                                       = set_object_generic("body", "body", "block", "poem", "", obj_cite_digits.object_number);
+      comp_obj_poem_ocn.metainfo.identifier                   = obj_cite_digits.identifier;
+      comp_obj_poem_ocn.metainfo.object_number_off            = obj_cite_digits.off;
+      comp_obj_poem_ocn.metainfo.o_n_book_index               = obj_cite_digits.bkidx;
+      comp_obj_poem_ocn.metainfo.object_number_type           = obj_cite_digits.type;
+      the_document_body_section                               ~= comp_obj_poem_ocn;
+      pith["block_is"]                                        = eN.blk_is.poem;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+    } else if (pith["block_is"] == eN.blk_is.code) {
+      obj_cite_digits = ocn_emit(pith["ocn"]);
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "code";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+        = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+      an_object["substantive"]                                = substantive_obj_misc_struct.obj_txt;
+      anchor_tag                                              = substantive_obj_misc_struct.anchor_tag;
+      comp_obj_                                               = set_object_generic("body", "body", "block", "code", an_object["substantive"], obj_cite_digits.object_number);
+      comp_obj_.metainfo.identifier                           = obj_cite_digits.identifier;
+      comp_obj_.metainfo.object_number_off                    = obj_cite_digits.off;
+      comp_obj_.metainfo.o_n_book_index                       = obj_cite_digits.bkidx;
+      comp_obj_.metainfo.object_number_type                   = obj_cite_digits.type;
+      comp_obj_.metainfo.syntax                               = an_object["syntax"];
+      comp_obj_.metainfo.attrib                               = an_object["attrib"];
+      comp_obj_.code_block.linenumbers                        = (an_object["attrib"].match(rgx.code_numbering)) ? true : false;
+      comp_obj_.tags.html_segment_anchor_tag_is               = tag_in_seg["seg_lv4"];
+      comp_obj_.tags.epub_segment_anchor_tag_is               = tag_in_seg["seg_lv1to4"];
+      comp_obj_.has.inline_notes_reg                          = substantive_obj_misc_struct.has_notes_reg;
+      comp_obj_.has.inline_notes_star                         = substantive_obj_misc_struct.has_notes_star;
+      comp_obj_.has.inline_links                              = substantive_obj_misc_struct.has_links;
+      the_document_body_section                               ~= comp_obj_;
+      pith["block_is"]                                        = eN.blk_is.code;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+      ++cntr;
+    } else if (pith["block_is"]    == eN.blk_is.table) {
+      comp_obj_ = comp_obj_.init;
+      obj_cite_digits = ocn_emit(pith["ocn"]);
+      an_object["bookindex_nugget"]
+        = ("bookindex_nugget" in an_object) ? an_object["bookindex_nugget"] : "";
+      bookindex_unordered_hashes
+        = bookindex_extract_hash.bookindex_nugget_hash(
+          an_object["bookindex_nugget"],
+          obj_cite_digits,
+          tag_in_seg
+        );
+      an_object["is"]                                         = "table";
+      auto comp_obj_location
+        = node_construct.node_location_emitter(
+          content_non_header,
+          tag_in_seg,
+          lev_anchor_tag,
+          tag_assoc,
+          obj_cite_digits,
+          cntr,
+          heading_ptr-1,
+          an_object["is"]
+        );
+      ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+        = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+      an_object["substantive"]                                = substantive_obj_misc_struct.obj_txt;
+      comp_obj_                                               = comp_obj_.init;
+      comp_obj_.metainfo.ocn                                  = obj_cite_digits.object_number;
+      comp_obj_.metainfo.identifier                           = obj_cite_digits.identifier;
+      comp_obj_.metainfo.object_number_off                    = obj_cite_digits.off;
+      comp_obj_.tags.html_segment_anchor_tag_is               = tag_in_seg["seg_lv4"];
+      comp_obj_.tags.epub_segment_anchor_tag_is               = tag_in_seg["seg_lv1to4"];
+      comp_obj_.metainfo.o_n_book_index                       = obj_cite_digits.bkidx;
+      comp_obj_.metainfo.object_number_type                   = obj_cite_digits.type;
+      comp_obj_                                               = comp_obj_.flow_table_instructions(an_object["table_head"]);
+      {
+        auto _get = comp_obj_.flow_table_substantive_munge(an_object["substantive"]);
+        {
+          comp_obj_           = _get.table_object;
+          an_object["substantive"] = _get.table_substantive;
+        }
+      }
+      the_document_body_section                               ~= comp_obj_;
+      pith["block_is"]                                        = eN.blk_is.table;
+      pith["block_state"]                                     = eN.blk_state.off;
+      pith["block_delim"]                                     = eN.blk_delim.off;
+      object_reset(an_object);
+      processing.remove("verse");
+      ++cntr;
+    }
+  }
+  ST_flow_block_flag_line_empty ret;
+  {
+    ret.this_object                = an_object;
+    ret.the_document_body_section  = the_document_body_section;
+    ret.bookindex_unordered_hashes = bookindex_unordered_hashes;
+    ret.obj_cite_digits            = obj_cite_digits;
+    ret.comp_obj_                  = comp_obj_; //
+    ret.cntr                       = cntr;
+    ret.pith                       = pith;
+  }
+  return ret;
+}
+#+END_SRC
+
+***** ϝ images
+
+#+NAME: ocdaFunc_images
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - images
+@safe string[] extract_images()(string content_block) {
+  static auto rgx = RgxI();
+  string[] images_;
+  if (auto m = content_block.matchAll(rgx.image)) {
+    images_ ~= m.captures[1];
+  }
+  return images_;
+}
+@system auto _image_dimensions(O,M)(O obj, M manifested) {
+  static auto rgx = RgxI();
+  if (obj.has.image_without_dimensions) {
+    import std.math;
+    import imageformats;
+    int w, h, chans;
+    real _w, _h;
+    int max_width = 640;
+    foreach (img; obj.text.matchAll(rgx.inline_image_without_dimensions)) {
+      try {
+        read_image_info(manifested.src.image_dir_path ~ "/" ~ img["img"], w, h, chans);
+      } catch (Exception ex) {
+        writeln("WARNING, image not found: ", img["img"], "\n  ", manifested.src.image_dir_path ~ "/" ~ img["img"]);
+      }
+      // calculate, decide max width and proportionally reduce to keep w & h within it
+      debug(images) { writeln("width: ", w, ", height: ", h); }
+      if (w > max_width) {
+        _w = max_width;
+        _h = round((max_width / w.to!real) * h.to!real);
+      } else {
+        _w = w;
+        _h = h;
+      }
+      obj.text = obj.text.replaceFirst(
+        rgx.inline_image_without_dimensions,
+        format(q"┃%s☼%s,w%sh%s %s┃",
+          "$1",
+          "$3",
+          _w.to!string,
+          _h.to!string,
+          "$6",
+        )
+      );
+    }
+    debug(images) { writeln("image without dimensions: ", obj.text); }
+  }
+  return obj;
+}
+// ↑ - images
+#+END_SRC
+
+***** ϝ links
+
+#+NAME: ocdaFunc_links
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - links
+@safe auto _links(O)(O obj) {
+  static auto rgx = RgxI();
+  if (auto m = obj.text.match(rgx.inline_link_stow_uri)) {
+    debug(links) {
+      writeln("number of link matches to stow: ", (obj.text.match(rgx.inline_link_stow_uri)).count);
+      writeln("links to stow: ", (obj.text.match(rgx.inline_link_stow_uri)));
+    }
+    int _n_matches = (obj.text.match(rgx.inline_link_stow_uri)).count.to!int;
+    for(int i = 0; i < _n_matches; ++i) {
+      if (obj.text.match(rgx.inline_link_stow_uri)) {
+        obj.stow.link ~= obj.text.matchFirst(rgx.inline_link_stow_uri)[2];
+        obj.text = obj.text.replaceFirst(
+          rgx.inline_link_stow_uri,
+          format(q"┃┥%s┝┤%s├┃", "$1", i)
+        );
+      }
+    }
+  }
+  return obj;
+}
+// ↑ - links
+#+END_SRC
+
+***** ϝ text by line
+
+#+NAME: ocdaFunc_text_by_line
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - text by line (blocks etc.)
+@safe ST_txt_by_line_block_start txt_by_line_block_start()(
+  char[]         line,
+  uint[string]   pith,
+  uint[string]   dochas,
+  string[string] object_number_poem
+) {
+  static auto rgx = RgxI();
+  if (auto m = line.matchFirst(rgx.block_curly_code_open)) {
+    dochas["codeblock"]++;
+    an_object["lang"]               = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["syntax"]             = (m["syntax"]) ? m["syntax"].to!string : "";
+    debug(codecurly) { writefln( "* [code curly] %s", line); }                              // code (curly) open
+    pith["block_is"]                = eN.blk_is.code;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+  } else if (auto m = line.matchFirst(rgx.block_curly_poem_open)) {
+    dochas["poem"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(poem) { writefln( "* [poem curly] %s", line); }                              // poem (curly) open
+    object_number_poem["start"]     = obj_cite_digits.object_number.to!string;
+    pith["block_is"]                = eN.blk_is.poem;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+    pith["verse_new"]               = eN.bi.on;
+  } else if (auto m = line.matchFirst(rgx.block_curly_group_open)) {
+    dochas["group"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(group) { writefln( "* [group curly] %s", line); }                             // group (curly) open
+    pith["block_is"]                = eN.blk_is.group;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+  } else if (auto m = line.matchFirst(rgx.block_curly_block_open)) {
+    dochas["block"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(block) { writefln( "* [block curly] %s", line); }
+    pith["block_is"]                = eN.blk_is.block;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+  } else if (auto m = line.matchFirst(rgx.block_curly_quote_open)) {
+    dochas["quote"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = m["attrib"].to!string;
+    an_object["lang"]               = m["lang"].to!string;
+    debug(quote) { writefln( "* [quote curly] %s", line); }
+    pith["block_is"]                = eN.blk_is.quote;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+  } else if (auto m = line.matchFirst(rgx.block_curly_table_open)) {           // curly table open
+    debug(table) { writefln( "* [table curly] %s", line); }
+    dochas["table"] ++;
+    an_object["table_head"]         = m["attrib"].to!string;
+    an_object["block_type"]         = "curly";
+    pith["block_is"]                = eN.blk_is.table;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly;
+  } else if (auto m = line.matchFirst(rgx.block_curly_table_special_markup)) { // table: special table block markup syntax!
+    dochas["table"]++;
+    an_object["table_head"]         = m["attrib"].to!string;
+    an_object["block_type"]         = "special";
+    pith["block_is"]                = eN.blk_is.table;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.curly_special;
+  } else if (auto m = line.matchFirst(rgx.block_tic_code_open)) {
+    dochas["codeblock"]++;
+    an_object["lang"]               = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["syntax"]             = (m["syntax"]) ? m["syntax"].to!string : "";
+    debug(codetic) { writefln( "* [code tic] %s", line); }
+    pith["block_is"]                = eN.blk_is.code;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+  } else if (auto m = line.matchFirst(rgx.block_tic_poem_open)) {
+    dochas["poem"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(poem) { writefln( "* [poem tic] %s", line); }
+    object_number_poem["start"]     = obj_cite_digits.object_number.to!string;
+    pith["block_is"]                = eN.blk_is.poem;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+    pith["verse_new"]               = eN.bi.on;
+  } else if (auto m = line.matchFirst(rgx.block_tic_group_open)) {
+    dochas["group"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(group) { writefln( "* [group tic] %s", line); }
+    pith["block_is"]                = eN.blk_is.group;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+  } else if (auto m = line.matchFirst(rgx.block_tic_block_open)) {
+    dochas["block"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = (m["attrib"]) ? m["attrib"].to!string : "";
+    an_object["lang"]               = (m["lang"]) ? m["lang"].to!string : "";
+    debug(block) { writefln( "* [block tic] %s", line); }
+    pith["block_is"]                = eN.blk_is.block;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+  } else if (auto m = line.matchFirst(rgx.block_tic_quote_open)) {
+    dochas["quote"]++;
+    an_object["syntax"]             = "";
+    an_object["attrib"]             = m["attrib"].to!string;
+    an_object["lang"]               = m["lang"].to!string;
+    debug(quote) { writefln( "* [quote tic] %s", line);                        // quote (tic) open
+    }
+    pith["block_is"]                = eN.blk_is.quote;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+  } else if (auto m = line.matchFirst(rgx.block_tic_table_open)) {             // tic table open
+    debug(table) { writefln( "* [table tic] %s", line); }
+    dochas["table"] ++;
+    an_object["table_head"]         = m["attrib"].to!string;
+    an_object["block_type"]         = "tic";
+    pith["block_is"]                = eN.blk_is.table;
+    pith["block_state"]             = eN.blk_state.on;
+    pith["block_delim"]             = eN.blk_delim.tic;
+  }
+  ST_txt_by_line_block_start ret;
+  {
+    ret.pith               = pith;
+    ret.dochas             = dochas;
+    ret.object_number_poem = object_number_poem;
+  }
+  return ret;
+}
+@safe ST_txt_by_line_block_generic txt_by_line_block_group()(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+) {
+  static auto rgx = RgxI();
+  if (pith["block_is"] == eN.blk_is.group) {
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_group_close)) {
+        debug(group) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.group;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(group) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (line.matchFirst(rgx.block_tic_close)) {
+        debug(group) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.group;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(group) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    }
+  }
+  ST_txt_by_line_block_generic ret;
+  {
+    ret.pith        = pith;
+    ret.this_object = an_object;
+  }
+  return ret;
+}
+@safe ST_txt_by_line_block_generic txt_by_line_block_block()(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+) {
+  static auto rgx = RgxI();
+  if (pith["block_is"] == eN.blk_is.block) {
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_block_close)) {
+        debug(block) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.block;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(block) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (line.matchFirst(rgx.block_tic_close)) {
+        debug(block) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.block;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(block) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    }
+  }
+  ST_txt_by_line_block_generic ret;
+  {
+    ret.pith        = pith;
+    ret.this_object = an_object;
+  }
+  return ret;
+}
+@safe ST_txt_by_line_block_poem txt_by_line_block_poem(CMM)(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+  int             cntr,
+  string[string]  object_number_poem,
+  CMM             conf_make_meta,
+  string[string]  tag_in_seg,
+) {
+  static auto rgx = RgxI();
+  if (pith["block_is"] == eN.blk_is.poem) {
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_poem_close)) {
+        if (an_object_key in an_object
+        || processing.length > 0) {
+          an_object[an_object_key]        = "";
+          debug(poem) { writefln( "* [poem curly] %s", line); }
+          if (processing.length > 0) {
+            an_object[an_object_key]      = processing["verse"];
+          }
+          debug(poem) {
+            writeln(__LINE__);
+            writefln( "* %s %s", obj_cite_digits.object_number, line);
+          }
+          if (an_object.length > 0) {
+            debug(poem) { writeln( obj_cite_digits.object_number, an_object[an_object_key]); }
+            an_object["is"]                                   = "verse";
+            ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+              = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+            an_object["substantive"]                          = substantive_obj_misc_struct.obj_txt;
+            anchor_tag                                        = substantive_obj_misc_struct.anchor_tag;
+            comp_obj_                                         = set_object_generic("body", "body", "block", "verse", an_object["substantive"], obj_cite_digits.object_number);
+            comp_obj_.metainfo.identifier                     = obj_cite_digits.identifier;
+            comp_obj_.metainfo.object_number_off              = obj_cite_digits.off;
+            comp_obj_.metainfo.o_n_book_index                 = obj_cite_digits.bkidx;
+            comp_obj_.metainfo.object_number_type             = obj_cite_digits.type;
+            comp_obj_.tags.html_segment_anchor_tag_is         = tag_in_seg["seg_lv4"];
+            comp_obj_.tags.epub_segment_anchor_tag_is         = tag_in_seg["seg_lv1to4"];
+            comp_obj_.has.inline_notes_reg                    = substantive_obj_misc_struct.has_notes_reg;
+            comp_obj_.has.inline_notes_star                   = substantive_obj_misc_struct.has_notes_star;
+            comp_obj_.has.inline_links                        = substantive_obj_misc_struct.has_links;
+            the_document_body_section                         ~= comp_obj_;
+            tag_assoc                                         = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+          }
+          object_reset(an_object);
+          processing.remove("verse");
+          ++cntr;
+        }
+        object_number_poem["end"]   = obj_cite_digits.object_number.to!string;
+        pith["block_is"]            = eN.blk_is.poem;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        processing["verse"] ~= line ~= "\n";
+        if (pith["verse_new"] == eN.bi.on) {
+          obj_cite_digits = ocn_emit(pith["ocn"]);
+          pith["verse_new"]         = eN.bi.off;
+        } else if (line.matchFirst(rgx.newline_eol_delimiter_only)) {
+          processing["verse"]       = processing["verse"].stripRight;
+          verse_line                = eN.bi.off;
+          pith["verse_new"]         = eN.bi.on;
+        }
+        if (pith["verse_new"] == eN.bi.on) {
+          verse_line = 1;
+          an_object[an_object_key]  = processing["verse"];
+          debug(poem) { writefln(
+              "* %s curly\n%s",
+              obj_cite_digits.object_number,
+              an_object[an_object_key]
+            );
+          }
+          processing.remove("verse");
+          an_object["is"]                                     = "verse";
+          auto comp_obj_location = node_construct.node_location_emitter(
+            content_non_header,
+            tag_in_seg,
+            lev_anchor_tag,
+            tag_assoc,
+            obj_cite_digits,
+            cntr,
+            heading_ptr-1,
+            an_object["is"]
+          );
+          ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+            = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+          an_object["substantive"]                            = substantive_obj_misc_struct.obj_txt;
+          anchor_tag                                          = substantive_obj_misc_struct.anchor_tag;
+          comp_obj_                                           = set_object_generic("body", "body", "block", "verse", an_object["substantive"], obj_cite_digits.object_number);
+          comp_obj_.metainfo.identifier                       = obj_cite_digits.identifier;
+          comp_obj_.metainfo.object_number_off                = obj_cite_digits.off;
+          comp_obj_.metainfo.o_n_book_index                   = obj_cite_digits.bkidx;
+          comp_obj_.metainfo.object_number_type               = obj_cite_digits.type;
+          comp_obj_.tags.html_segment_anchor_tag_is           = tag_in_seg["seg_lv4"];
+          comp_obj_.tags.epub_segment_anchor_tag_is           = tag_in_seg["seg_lv1to4"];
+          comp_obj_.has.inline_notes_reg                      = substantive_obj_misc_struct.has_notes_reg;
+          comp_obj_.has.inline_notes_star                     = substantive_obj_misc_struct.has_notes_star;
+          comp_obj_.has.inline_links                          = substantive_obj_misc_struct.has_links;
+          the_document_body_section                           ~= comp_obj_;
+          tag_assoc                                           = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+          object_reset(an_object);
+          processing.remove("verse");
+          ++cntr;
+        }
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (auto m = line.matchFirst(rgx.block_tic_close)) {
+        an_object[an_object_key] = "verse";
+        debug(poem) { writefln( "* [poem tic] %s", line); }
+        if (processing.length > 0) {
+          an_object[an_object_key]  = processing["verse"];
+        }
+        if (an_object.length > 0) {
+          debug(poem) { writeln(__LINE__); writeln(obj_cite_digits.object_number, line); }
+          processing.remove("verse");
+          an_object["is"]                                     = "verse";
+          ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+            = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+          an_object["substantive"]                            = substantive_obj_misc_struct.obj_txt;
+          anchor_tag                                          = substantive_obj_misc_struct.anchor_tag;
+          comp_obj_                                           = set_object_generic("body", "body", "block", "verse", an_object["substantive"], obj_cite_digits.object_number);
+          comp_obj_.metainfo.identifier                       = obj_cite_digits.identifier;
+          comp_obj_.metainfo.object_number_off                = obj_cite_digits.off;
+          comp_obj_.metainfo.o_n_book_index                   = obj_cite_digits.bkidx;
+          comp_obj_.metainfo.object_number_type               = obj_cite_digits.type;
+          comp_obj_.tags.html_segment_anchor_tag_is           = tag_in_seg["seg_lv4"];
+          comp_obj_.tags.epub_segment_anchor_tag_is           = tag_in_seg["seg_lv1to4"];
+          comp_obj_.has.inline_notes_reg                      = substantive_obj_misc_struct.has_notes_reg;
+          comp_obj_.has.inline_notes_star                     = substantive_obj_misc_struct.has_notes_star;
+          comp_obj_.has.inline_links                          = substantive_obj_misc_struct.has_links;
+          the_document_body_section                           ~= comp_obj_;
+          tag_assoc                                           = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+          object_number_poem["end"]                           = obj_cite_digits.object_number.to!string;
+          object_reset(an_object);
+          processing.remove("verse");
+          ++cntr;
+        }
+        pith["block_is"]            = eN.blk_is.poem;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        processing["verse"]         ~= line ~= "\n";
+        if (pith["verse_new"] == eN.bi.on) {
+          obj_cite_digits           = ocn_emit(pith["ocn"]);
+          pith["verse_new"]         = eN.bi.off;
+        } else if (line.matchFirst(rgx.newline_eol_delimiter_only)) {
+          processing["verse"]       = processing["verse"].stripRight;
+          pith["verse_new"]         = eN.bi.on;
+          verse_line                = eN.bi.off;
+        }
+        if (pith["verse_new"] == eN.bi.on) {
+          verse_line = 1;
+          an_object[an_object_key]  = processing["verse"];
+          debug(poem) { writefln(
+              "* %s tic\n%s",
+              obj_cite_digits.object_number,
+              an_object[an_object_key]
+            );
+          }
+          processing.remove("verse");
+          an_object["is"]                                     = "verse";
+          auto comp_obj_location
+            = node_construct.node_location_emitter(
+              content_non_header,
+              tag_in_seg,
+              lev_anchor_tag,
+              tag_assoc,
+              obj_cite_digits,
+              cntr,
+              heading_ptr-1,
+              an_object["is"]
+            );
+          ST_txtAndAnchorTagPlusHasFootnotesUrlsImages substantive_obj_misc_struct
+            = obj_im.obj_inline_markup_and_anchor_tags_and_misc(an_object, an_object_key, conf_make_meta, No._new_doc);
+          an_object["substantive"]                            = substantive_obj_misc_struct.obj_txt;
+          anchor_tag                                          = substantive_obj_misc_struct.anchor_tag;
+          comp_obj_                                           = set_object_generic("body", "body", "block", "verse", an_object["substantive"], obj_cite_digits.object_number);
+          comp_obj_.metainfo.identifier                       = obj_cite_digits.identifier;
+          comp_obj_.metainfo.object_number_off                = obj_cite_digits.off;
+          comp_obj_.metainfo.o_n_book_index                   = obj_cite_digits.bkidx;
+          comp_obj_.metainfo.object_number_type               = obj_cite_digits.type;
+          comp_obj_.tags.html_segment_anchor_tag_is           = tag_in_seg["seg_lv4"];
+          comp_obj_.tags.epub_segment_anchor_tag_is           = tag_in_seg["seg_lv1to4"];
+          comp_obj_.has.inline_notes_reg                      = substantive_obj_misc_struct.has_notes_reg;
+          comp_obj_.has.inline_notes_star                     = substantive_obj_misc_struct.has_notes_star;
+          comp_obj_.has.inline_links                          = substantive_obj_misc_struct.has_links;
+          the_document_body_section                           ~= comp_obj_;
+          tag_assoc                                           = an_object.inline_para_link_anchor(tag_in_seg, tag_assoc);
+          object_reset(an_object);
+          processing.remove("verse");
+          ++cntr;
+        }
+      }
+    }
+  }
+  ST_txt_by_line_block_poem ret;
+  {
+    ret.cntr        = cntr;
+    ret.pith        = pith;
+    ret.this_object = an_object;
+  }
+  return ret;
+}
+@safe ST_txt_by_line_block_generic txt_by_line_block_code()(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+) {
+  static auto rgx = RgxI();
+  if ( pith["block_is"] == eN.blk_is.code) {
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_code_close)) {
+        debug(codecurly) { writeln(line); }
+        an_object[an_object_key] = an_object[an_object_key]
+          .replaceFirst(rgx.newline_eol_delimiter_only, "")
+          .stripRight;
+        pith["block_is"]            = eN.blk_is.code;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(codecurly) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (line.matchFirst(rgx.block_tic_close)) {
+        debug(codetic) { writeln(line); }
+        an_object[an_object_key] = an_object[an_object_key]
+          .replaceFirst(rgx.newline_eol_delimiter_only, "")
+          .stripRight;
+        pith["block_is"]            = eN.blk_is.code;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(codetic) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    }
+  }
+  ST_txt_by_line_block_generic ret;
+  {
+    ret.pith        = pith;
+    ret.this_object = an_object;
+  }
+  return ret;
+}
+@system auto txt_by_line_block_table(CMM)(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+  CMM             conf_make_meta,
+) {
+  static auto rgx = RgxI();
+  if (pith["block_is"] == eN.blk_is.table) {
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_table_close)) {
+        debug(table) { writeln(line); }
+        pith["block_is"]            = eN.blk_is.table;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(table) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.curly_special) {
+      if (line.empty) {
+        pith["block_is"]            = eN.blk_is.table;
+        pith["block_state"]         = eN.blk_state.off;
+        pith["block_delim"]         = eN.blk_delim.off;
+        {
+          auto _get = line.flow_table_closed_make_special_notation_table_(
+            an_object,
+            the_document_body_section,
+            obj_cite_digits,
+            comp_obj_,
+            cntr,
+            pith,
+            conf_make_meta,
+          );
+          {
+            an_object                 = _get.this_object;
+            the_document_body_section = _get.the_document_body_section;
+            obj_cite_digits           = _get.obj_cite_digits;
+            comp_obj_                 = _get.comp_obj_;
+            cntr                      = _get.cntr;
+            pith                      = _get.pith;
+          }
+        }
+      } else {
+        debug(table) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (line.matchFirst(rgx.block_tic_close)) {
+        debug(table) { writeln(line); }
+        pith["block_is"]            = eN.blk_is.table;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(table) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    }
+  }
+  struct ST_txt_by_line_block_table {
+    CMM             conf_make_meta;
+    uint[string]    pith;
+    string[string]  this_object;
+  }
+  ST_txt_by_line_block_table ret;
+  {
+    ret.conf_make_meta = conf_make_meta,
+    ret.pith           = pith;
+    ret.this_object    = an_object;
+  }
+  return ret;
+}
+@safe ST_txt_by_line_block_generic txt_by_line_block_quote()(
+  char[]          line,
+  string[string]  an_object,
+  uint[string]    pith,
+) {
+  static auto rgx = RgxI();
+  if (pith["block_is"] == eN.blk_is.quote){
+    if (pith["block_delim"] == eN.blk_delim.curly) {
+      if (line.matchFirst(rgx.block_curly_quote_close)) {
+        debug(quote) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.quote;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(quote) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    } else if (pith["block_delim"] == eN.blk_delim.tic) {
+      if (line.matchFirst(rgx.block_tic_close)) {
+        debug(quote) { writeln(line); }
+        an_object[an_object_key]    = an_object[an_object_key].stripRight;
+        pith["block_is"]            = eN.blk_is.quote;
+        pith["block_state"]         = eN.blk_state.closing;
+        pith["block_delim"]         = eN.blk_delim.off;
+      } else {
+        debug(quote) { writeln(line); }
+        an_object[an_object_key] ~= line ~= "\n";
+      }
+    }
+  }
+  ST_txt_by_line_block_generic ret;
+  {
+    ret.pith        = pith;
+    ret.this_object = an_object;
+  }
+  return ret;
+}
+@system ST_txt_by_line_block_biblio txt_by_line_block_biblio(
+  char[]                  line,
+  uint[string] pith,
+  int          bib_entry,
+  string       biblio_entry_str_json,
+  string[]     biblio_arr_json,
+) {
+  mixin spineBiblio;
+  auto jsn = BibJsnStr();
+  static auto rgx = RgxI();
+  string biblio_tag_map()(string abr) {
+    auto btm = [
+      "au"        : "author_raw",
+      "ed"        : "editor_raw",
+      "ti"        : "fulltitle",
+      "lng"       : "language",
+      "jo"        : "journal",
+      "vol"       : "volume",
+      "edn"       : "edition",
+      "yr"        : "year",
+      "pl"        : "place",
+      "pb"        : "publisher",
+      "pub"       : "publisher",
+      "pg"        : "pages",
+      "pgs"       : "pages",
+      "sn"        : "short_name"
+    ];
+    return btm[abr];
+  }
+  if (line.matchFirst(rgx.heading_biblio)) {
+    pith["section"] = eN.sect.bibliography;
+  }
+  if (line.empty) {
+    debug {
+      debug(biblioblock) { writeln("---"); }
+      debug(biblioblockinclude) { writeln(biblio_entry_str_json.length); }
+    }
+    if ((bib_entry == eN.bi.off)
+    && (biblio_entry_str_json.empty)) {
+      bib_entry = eN.bi.on;
+      biblio_entry_str_json = jsn.biblio_entry_tags_jsonstr;
+    } else if (!(biblio_entry_str_json.empty)) {
+      bib_entry = eN.bi.off;
+      if (!(biblio_entry_str_json == jsn.biblio_entry_tags_jsonstr)) {
+        auto biblio_entry = parseJSON(biblio_entry_str_json);
+        if (biblio_entry["fulltitle"].str.empty) {
+          writeln("check problem entry (Title missing): ", biblio_entry_str_json);
+        } else if ((biblio_entry["author_raw"].str.empty) && (biblio_entry["editor_raw"].str.empty)) {
+          writeln("check problem entry (No author and no editor): ", biblio_entry_str_json);
+        } else {
+          biblio_arr_json ~= biblio_entry_str_json;
+        }
+        biblio_entry_str_json = jsn.biblio_entry_tags_jsonstr;
+      }
+    } else {
+      writeln("?? 2. ERROR ", biblio_entry_str_json, "??");
+      biblio_entry_str_json = "";
+    }
+  } else if (line.matchFirst(rgx.biblio_tags)) {
+    debug(biblioblock) { writeln(line); }
+    auto bt = line.match(rgx.biblio_tags);
+    bib_entry = eN.bi.off;
+    st = bt.captures[1].to!string;
+    auto header_tag_value = (bt.captures[2]).to!string;
+    JSONValue j = parseJSON(biblio_entry_str_json);
+    biblio_tag_name = (st.match(rgx.biblio_abbreviations))
+      ? (biblio_tag_map(st))
+      : st;
+    j.object[biblio_tag_name] = header_tag_value;
+    debug(bibliounsortedcheckduplicates) { writeln(biblio_tag_name, ": ", header_tag_value); writeln("--"); }
+    switch (biblio_tag_name) {
+    case "author_raw": // author_arr author (fn sn)
+      j["author_arr"]
+       = header_tag_value.split(rgx.arr_delimiter);
+      string tmp;
+      biblioAuthorLoop:
+      foreach (au; j["author_arr"].array) {
+        if (auto x = au.str.match(rgx.name_delimiter)) {
+          tmp ~= x.captures[2] ~ " " ~ x.captures[1] ~ ", ";
+        } else {
+          tmp ~= au.str;
+        }
+      }
+      tmp = tmp.replace(rgx.trailing_comma, "");
+      j["author"].str = tmp;
+      goto default;
+    case "editor_raw": // editor_arr editor (fn sn)
+      j["editor_arr"]
+        = header_tag_value.split(rgx.arr_delimiter);
+      string tmp;
+      biblioEditorLoop:
+      foreach (ed; j["editor_arr"].array) {
+        if (auto x = ed.str.match(rgx.name_delimiter)) {
+          tmp ~= x.captures[2] ~ " " ~ x.captures[1] ~ ", ";
+        } else {
+          tmp ~= ed.str;
+        }
+      }
+      tmp = tmp.replace(rgx.trailing_comma, "");
+      j["editor"].str = tmp;
+      goto default;
+    case "fulltitle": // title & subtitle
+      goto default;
+    default:
+      break;
+    }
+    auto s = j.toString();
+    debug(biblio1) { writefln(
+        "* %s: %s\n%s",
+        biblio_tag_name,
+        biblio_tag_entry,
+        j[biblio_tag_name]
+      );
+    }
+    if (line.match(rgx.comment)) {
+      writeln("ERROR", line, "COMMENT");
+      writeln("ERROR", s, "%%");
+    }
+    if (!(match(line, rgx.comment))) {
+      debug(biblioblockinclude) { writeln(line); }
+      biblio_entry_str_json = s;
+    } else {
+      biblio_entry_str_json = "";
+    }
+    header_tag_value        = "";
+  }
+  ST_txt_by_line_block_biblio ret;
+  {
+    ret.pith                  = pith;
+    ret.bib_entry             = bib_entry;
+    ret.biblio_entry_str_json = biblio_entry_str_json;
+    ret.biblio_arr_json       = biblio_arr_json;
+  }
+  return ret;
+}
+// ↑ - text by line
+#+END_SRC
+
+**** ϝ object
+***** ϝ object set (heading & generic)
+
+#+NAME: ocdaFunc_obj_set
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object set
+@safe ObjGenericComposite set_object_heading()(
+  string level,
+  string part,
+  string section,
+  string text,
+) {
+  ObjGenericComposite comp_obj;
+  {
+    comp_obj                                                = comp_obj.init;
+    comp_obj.metainfo.is_of_part                            = part;
+    comp_obj.metainfo.is_of_section                         = section;
+    comp_obj.metainfo.is_of_type                            = "para";
+    comp_obj.metainfo.is_a                                  = "heading";
+    comp_obj.text                                           = text;
+    comp_obj.metainfo.ocn                                   = 0;
+    if (level == "lev1") {
+      comp_obj.metainfo.heading_lev_markup                  = 1;
+      comp_obj.metainfo.heading_lev_collapsed               = 1;
+      comp_obj.metainfo.parent_ocn                          = 1;
+      comp_obj.metainfo.parent_lev_markup                   = 0;
+    } else if (level == "lev4") {
+      comp_obj.metainfo.heading_lev_markup                  = 4;
+      comp_obj.metainfo.heading_lev_collapsed               = 1;
+      comp_obj.metainfo.parent_ocn                          = 1;
+      comp_obj.metainfo.parent_lev_markup                   = 0;
+      comp_obj.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 1, 0, 0, 0];
+      comp_obj.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 1, 0, 0, 0, 0, 0];
+    }
+  }
+  return comp_obj;
+}
+@safe ObjGenericComposite set_object_generic()(
+  string part,
+  string section,
+  string type,
+  string is_a,
+  string text,
+  int ocn,
+) {
+  ObjGenericComposite comp_obj;
+  {
+    comp_obj                                                = comp_obj.init;
+    comp_obj.metainfo.is_of_part                            = part;
+    comp_obj.metainfo.is_of_section                         = section;
+    comp_obj.metainfo.is_of_type                            = type;
+    comp_obj.metainfo.is_a                                  = is_a;
+    comp_obj.text                                           = text;
+    comp_obj.metainfo.ocn                                   = ocn;
+  }
+  return comp_obj;
+}
+// ↑ - object set
+#+END_SRC
+
+***** ϝ object string inline munge
+
+#+NAME: ocdaFunc_obj_inline_munge
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object inline munge
+@safe static struct ObjInlineMarkupMunge {
+  string[string] obj_txt;
+  int n_foot, n_foot_reg, n_foot_sp_asterisk, n_foot_sp_plus;
+  string asterisks_, plus_;
+  string obj_txt_out, tail, note;
+  static auto rgx = RgxI();
+  static auto mkup = InlineMarkup();
+  int stage_reset_note_numbers = true;
+  private auto initialize_note_numbers() {
+    n_foot                          = 0;
+    n_foot_reg                      = 0;
+    n_foot_sp_asterisk              = 0;
+    n_foot_sp_plus                  = 0;
+  }
+  @safe static auto images()(string obj_txt_in) {
+    static auto mng = InlineMarkup();
+    // url matched
+    obj_txt_in = obj_txt_in.replaceAll(rgx.inline_notes_al_special, ""); // TODO reinstate when special footnotes are implemented
+    if (obj_txt_in.match(rgx.smid_image_generic)) {                            // images with and without links
+      debug(images) { writeln("Image: ", obj_txt_in); }
+      if (obj_txt_in.match(rgx.smid_image_with_dimensions)) {
+        obj_txt_in = obj_txt_in
+          .replaceAll(rgx.smid_image_with_dimensions, ("$1" ~ mkup.img ~ "$2,w$3h$4 " ~ "$5"))
+          .replaceAll(rgx.smid_image_delimit, ("$1"
+            ~ mkup.lnk_o ~ "$2".strip ~ mkup.lnk_c
+            ~ mkup.url_o ~ mkup.url_c));
+        debug(images) { writeln("IMAGE with size: ", obj_txt_in); }
+      } else if (obj_txt_in.match(rgx.smid_image)) {
+        obj_txt_in = obj_txt_in
+          .replaceAll(rgx.smid_image, ("$1" ~ mkup.img ~ "$2,w0h0" ~ "$3"))
+          .replaceAll(rgx.smid_image_delimit, ("$1"
+            ~ mkup.lnk_o ~ "$2".strip ~ mkup.lnk_c
+            ~ mkup.url_o ~ mkup.url_c));
+        debug(images) { writeln("IMAGE: ", obj_txt_in); } // decide on representation
+      }
+    }
+    return obj_txt_in;
+  }
+  @safe ST_txtPlusHasFootnotes footnotes_endnotes_markup_and_number_or_stars()(string obj_txt_in, bool reset_note_numbers) {
+    // endnotes (regular)
+    bool flg_notes_reg  = false;
+    bool flg_notes_star = false;
+    bool flg_notes_plus = false;
+    obj_txt_in = obj_txt_in.replaceAll(
+      rgx.inline_notes_curly,
+      (mkup.en_a_o ~ " $1" ~ mkup.en_a_c)
+    );
+    if (!(stage_reset_note_numbers) && reset_note_numbers) {
+      stage_reset_note_numbers = true;
+    }
+    obj_txt_out = "";
+    if (obj_txt_in.match(rgx.inline_notes_al_gen)) {
+      string[] _tmp_txt;
+      foreach (x; obj_txt_in.split("\n")) {
+        if (auto m = x.matchAll(rgx.inline_text_and_note_al_)) {
+          if (stage_reset_note_numbers) {
+            n_foot                  = 0;
+            n_foot_reg              = 0;
+            n_foot_sp_asterisk      = 0;
+            n_foot_sp_plus          = 0;
+          }
+          stage_reset_note_numbers = false;
+          foreach(n; m) {
+            if (n.hit.to!string.match(rgx.inline_al_delimiter_open_symbol_star)) {
+              flg_notes_star =  true;
+              ++n_foot_sp_asterisk;
+              asterisks_ = "*";
+              n_foot = n_foot_sp_asterisk;
+              _tmp_txt ~= n.hit.to!string.replaceFirst(
+                rgx.inline_al_delimiter_open_symbol_star,
+                (mkup.en_a_o ~ replicate(asterisks_, n_foot_sp_asterisk) ~ " ")
+              );
+            } else if (n.hit.to!string.match(rgx.inline_al_delimiter_open_symbol_plus)) {
+              flg_notes_plus =  true;
+              ++n_foot_sp_plus;
+              plus_ = "*";
+              n_foot = n_foot_sp_plus;
+              _tmp_txt ~= n.hit.to!string.replaceFirst(
+                rgx.inline_al_delimiter_open_symbol_plus,
+                (mkup.en_a_o ~ replicate(plus_, n_foot_sp_plus) ~ " ")
+              );
+            } else if (n.hit.to!string.matchFirst(rgx.inline_al_delimiter_open_regular)) {
+              string _tmp_str = n.hit.to!string;
+              flg_notes_reg =  true;
+              foreach (q; n.hit.to!string.matchAll(rgx.inline_al_delimiter_open_regular)) {
+                ++n_foot_reg;
+                n_foot = n_foot_reg;
+                _tmp_str = replaceFirst!(m => mkup.en_a_o ~ n_foot.to!string ~ " ")
+                  (_tmp_str, rgx.inline_al_delimiter_open_regular);
+              }
+              _tmp_txt ~= _tmp_str;
+            } else {
+              _tmp_txt ~= n.hit.to!string;
+            }
+          }
+          obj_txt_out = _tmp_txt.join("\n");
+        }
+      }
+    } else {
+      obj_txt_out = obj_txt_in;
+    }
+    ST_txtPlusHasFootnotes ret;
+    {
+      ret.obj_txt            = obj_txt_out;
+      ret.has_notes_reg      = flg_notes_reg;
+      ret.has_notes_star     = flg_notes_star;
+      ret.has_notes_plus     = flg_notes_plus;
+    }
+    return ret;
+  }
+  @safe private ST_txtPlusHasFootnotesUrlsImages object_notes_and_links_()(
+    string obj_txt_in,
+    bool reset_note_numbers = false
+  ) {
+    obj_txt_out = "";
+    bool urls = false;
+    bool images_without_dimensions = false;
+    tail = "";
+    // special endnotes
+    obj_txt_in = obj_txt_in.replaceAll(
+      rgx.inline_notes_curly_sp_asterisk,
+      (mkup.en_a_o ~ "*" ~ " $1" ~ mkup.en_a_c)
+    );
+    obj_txt_in
+      = obj_txt_in.replaceAll(
+        rgx.inline_notes_curly_sp_plus,
+        (mkup.en_a_o ~ "+" ~ " $1" ~ mkup.en_a_c)
+      );
+    // image matched
+    if (obj_txt_in.match(rgx.smid_image_generic)) {
+      obj_txt_in = images(obj_txt_in);
+      if (obj_txt_in.match(rgx.smid_mod_image_without_dimensions)) {
+        images_without_dimensions = true;
+      }
+    }
+    // url matched
+    if (obj_txt_in.match(rgx.smid_inline_url)) {
+      urls = true;
+      obj_txt_in = obj_txt_in.links_and_images;
+    }
+    if (auto m = obj_txt_in.match(rgx.para_inline_link_anchor)) {
+      obj_txt_in = obj_txt_in
+        .replaceAll(rgx.para_inline_link_anchor, "┃$1┃");
+    }
+    ST_txtPlusHasFootnotes ftn = footnotes_endnotes_markup_and_number_or_stars(obj_txt_in, reset_note_numbers);
+    obj_txt_out = ftn.obj_txt;
+    debug(footnotes) { writeln(obj_txt_out, tail); }
+    obj_txt_out = obj_txt_out ~ tail;
+    debug(footnotesdone) {
+      foreach(m; matchAll(obj_txt_out, (mkup.en_a_o ~ `\s*(.+?)` ~ mkup.en_a_c))) {
+        writeln(m[1]);
+        writeln(m.hit);
+      }
+    }
+    ST_txtPlusHasFootnotesUrlsImages ret;
+    {
+      ret.obj_txt                       = obj_txt_out;
+      ret.has_notes_reg                 = ftn.has_notes_reg;
+      ret.has_notes_star                = ftn.has_notes_star;
+      ret.has_notes_plus                = ftn.has_notes_plus;
+      ret.has_urls                      = urls;
+      ret.has_images_without_dimensions = images_without_dimensions;
+    }
+    return ret;
+  }
+  @safe private ST_txtPlusHasFootnotesUrlsImages object_only_()(
+    string obj_txt_in,
+    bool reset_note_numbers = false
+  ) {
+    ST_txtPlusHasFootnotesUrlsImages ret;
+    {
+      ret.obj_txt                       = obj_txt_in;
+      ret.has_notes_reg                 = false;
+      ret.has_notes_star                = false;
+      ret.has_notes_plus                = false;
+      ret.has_urls                      = false;
+      ret.has_images_without_dimensions = false;
+    }
+    return ret;
+  }
+  ST_txtPlusHasFootnotesUrlsImages init() {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_("");
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_heading()(
+    string obj_txt_in,
+    bool reset_note_numbers = false
+  ) {
+    obj_txt["munge"] = obj_txt_in
+     .replaceFirst(rgx.headings, "")
+     .replaceFirst(rgx.object_number_off_all, "")
+     .replaceFirst(rgx.markup_inline_linebreak, mkup.br_line_inline)
+     .strip;
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt["munge"], reset_note_numbers);
+    debug(munge) { writeln(__LINE__); writeln(obj_txt_in); writeln(__LINE__); writeln(obj_txt["munge"].to!string); }
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_para()(string obj_txt_in) {
+    obj_txt["munge"] = (obj_txt_in)
+      .replaceFirst(rgx.para_attribs, "")
+      .replaceFirst(rgx.object_number_off_all, "")
+      .replaceFirst(rgx.markup_inline_linebreak, mkup.br_line_inline);
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt["munge"]);
+    debug(munge) { writeln(__LINE__); writeln(obj_txt_in);
+      writeln(__LINE__);
+      writeln(obj_txt["munge"].to!string);
+    }
+    return ret;
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_quote()(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt_in.split("\n\n").join(" \\\\\n \\\\\n"));
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_group(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt_in.split("\n\n").join("\n" ~ mkup.br_line_spaced ~ "\n"));
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_block()(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt_in);
+    return ret;
+  }
+  invariant() {
+  }
+  @safe auto munge_verse()(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt_in);
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_code()(string obj_txt_in) {
+    obj_txt_in = obj_txt_in.replaceAll(rgx.space, mkup.nbsp);
+    ST_txtPlusHasFootnotesUrlsImages ret = object_only_(obj_txt_in);
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_table()(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_notes_and_links_(obj_txt_in);
+    return ret;
+  }
+  invariant() {
+  }
+  @safe ST_txtPlusHasFootnotesUrlsImages munge_comment()(string obj_txt_in) {
+    ST_txtPlusHasFootnotesUrlsImages ret = object_only_(obj_txt_in);
+    return ret;
+  }
+  invariant() {
+  }
+}
+// ↑ - object inline munge
+#+END_SRC
+
+***** ϝ object inline markup
+
+#+NAME: ocdaFunc_obj_inline_markup
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object inline markup
+static struct ObjInlineMarkup {
+  static auto rgx = RgxI();
+  static auto munge = ObjInlineMarkupMunge();
+  string[string] obj_txt;
+  string anchor_tag = "";
+  @safe ST_txtAndAnchorTagPlusHasFootnotesUrlsImages obj_inline_markup_and_anchor_tags_and_misc(CMM)(
+    string[string]   obj_,
+    string           obj_key_,
+    CMM              conf_make_meta,
+    Flag!"_new_doc"  _new_doc
+  ) {
+    obj_txt["munge"]                                = obj_[obj_key_].dup;
+    obj_txt["munge"]                                = (obj_["is"].match(ctRegex!(`verse|code`)))
+    ? obj_txt["munge"]
+    : obj_txt["munge"].strip;
+    if (_new_doc) {
+      anchor_tag = "";
+    }
+    auto x = munge.init;
+    ST_txtAndAnchorTagPlusHasFootnotesUrlsImages ret;
+    ret.obj_txt                       = "";
+    ret.anchor_tag                    = "";
+    ret.has_notes_reg                 = false;
+    ret.has_notes_star                = false;
+    ret.has_notes_plus                = false;
+    ret.has_links                     = false;
+    ret.has_images_without_dimensions = false;
+    if ((obj_["is"] == "para")
+      || (obj_["is"] == "heading")
+      || (obj_["is"] == "quote")
+      || (obj_["is"] == "group")
+      || (obj_["is"] == "block")
+      || (obj_["is"] == "verse")) {
+      obj_txt["munge"]                              = (obj_txt["munge"]).inline_markup_faces;
+      obj_txt["munge"]                              = (obj_txt["munge"]).links_and_images;
+    }
+    switch (obj_["is"]) {
+    case "heading":
+      if (_new_doc) {
+        anchor_tag                                  = "";
+      }
+      obj_txt["munge"] = _configured_auto_heading_numbering_and_segment_anchor_tags(obj_txt["munge"], obj_, conf_make_meta, _new_doc);
+      obj_txt["munge"] = _make_segment_anchor_tags_if_none_provided(obj_txt["munge"], obj_["lev"], _new_doc);
+      if (auto m = obj_txt["munge"].match(rgx.heading_anchor_tag)) {
+        anchor_tag                                  = m.captures[1];
+      } else if (obj_["lev"] == "1") {
+        writeln("heading anchor tag missing: ", obj_txt["munge"]);
+      }
+      x                                             = munge.munge_heading(obj_txt["munge"], reset_note_numbers);
+      reset_note_numbers = false;
+      goto default;
+    case "para":
+      x                                             = munge.munge_para(obj_txt["munge"]);
+      goto default;
+    case "group":
+      x                                             = munge.munge_group(obj_txt["munge"]);
+      goto default;
+    case "block":
+      x                                             = munge.munge_block(obj_txt["munge"]);
+      goto default;
+    case "quote":
+      x                                             = munge.munge_quote(obj_txt["munge"]);
+      goto default;
+    case "verse":
+      x                                             = munge.munge_verse(obj_txt["munge"]);
+      goto default;
+    case "code":
+      x                                             = munge.munge_code(obj_txt["munge"]);
+      goto default;
+    case "table":
+      x                                             = munge.munge_table(obj_txt["munge"]);
+      goto default;
+    case "comment":
+      x                                             = munge.munge_comment(obj_txt["munge"]);
+      goto default;
+    case "doc_end_reset":
+      munge.initialize_note_numbers();
+      break;
+    default:
+      // para, heading, group, block, verse
+      ret.obj_txt                       = x.obj_txt;
+      ret.anchor_tag                    = anchor_tag;
+      ret.has_notes_reg                 = x.has_notes_reg;
+      ret.has_notes_star                = x.has_notes_star;
+      ret.has_notes_plus                = x.has_notes_plus;
+      ret.has_links                     = x.has_urls;
+      ret.has_images_without_dimensions = x.has_images_without_dimensions;
+      break;
+    }
+    anchor_tag = "";
+    return ret;
+  }
+  invariant() {
+  }
+  @safe auto _clean_heading_toc_()(
+    char[] heading_toc_,
+  ) {
+   auto m = (cast(char[]) heading_toc_).matchFirst(rgx.heading);
+   heading_toc_ = (m.post).replaceAll(rgx.inline_notes_curly_gen, "");
+   return heading_toc_;
+  };
+  @safe ST_flow_table_of_contents_gather_headings flow_table_of_contents_gather_headings(CMM)( //
+    string[string]         obj_,
+    CMM                    conf_make_meta,
+    string[string]         tag_in_seg,
+    string                 _anchor_tag,
+    string[][string]       lev4_subtoc,
+    ObjGenericComposite[]  the_document_toc_section,
+  ) {
+    ObjGenericComposite comp_obj_;
+    mixin InternalMarkup;
+    static auto mkup = InlineMarkup();
+    char[] heading_toc_                             = (obj_["substantive"].dup.strip.to!(char[]))
+      .replaceAll(rgx.inline_notes_al, "");
+    heading_toc_                                    = _clean_heading_toc_(heading_toc_);
+    auto attrib = "";
+    string toc_txt_, subtoc_txt_;
+    int[string] indent;
+    if (obj_["lev_markup_number"].to!int > 0) {
+      indent = [
+        "hang_position" : obj_["lev_markup_number"].to!int,
+        "base_position" : obj_["lev_markup_number"].to!int,
+      ];
+      toc_txt_ = format("%s%s%s%s#%s%s",
+        mkup.lnk_o,
+        heading_toc_.strip,
+        mkup.lnk_c,
+        mkup.url_o,
+        _anchor_tag,
+        mkup.url_c,
+      );
+      toc_txt_= toc_txt_.links_and_images;
+      comp_obj_                                  = set_object_generic("frontmatter", "toc", "para", "toc", toc_txt_.to!string.strip, 0);
+      comp_obj_.metainfo.identifier              = "";
+      comp_obj_.metainfo.object_number_off       = true;
+      comp_obj_.metainfo.object_number_type      = 0;
+      comp_obj_.metainfo.dummy_heading           = (an_object["dummy_heading_status"] == "t") ? true: false;
+      comp_obj_.attrib.indent_hang               = indent["hang_position"];
+      comp_obj_.attrib.indent_base               = indent["base_position"];
+      comp_obj_.attrib.bullet                    = false;
+      comp_obj_.has.inline_links                 = true;
+      the_document_toc_section                   ~= comp_obj_;
+    }
+    comp_obj_                                    = comp_obj_.init;
+    comp_obj_.metainfo.is_of_part                = "frontmatter";
+    comp_obj_.metainfo.is_of_section             = "toc";
+    comp_obj_.metainfo.is_of_type                = "para";
+    comp_obj_.metainfo.is_a                      = "toc";
+    comp_obj_.metainfo.ocn                       = 0;
+    comp_obj_.metainfo.identifier                = "";
+    comp_obj_.metainfo.object_number_off         = true;
+    comp_obj_.metainfo.object_number_type        = 0;
+    comp_obj_.metainfo.dummy_heading             = (an_object["dummy_heading_status"] == "t") ? true: false;
+    comp_obj_.attrib.bullet                      = false;
+    comp_obj_.has.inline_links                   = true;
+    switch (obj_["lev_markup_number"].to!int) {
+    case 0: .. case 3:
+      break;
+    case 4:
+      lev4_subtoc[tag_in_seg["seg_lv4"]] = [];
+      break;
+    case 5: .. case 7:
+      subtoc_txt_ = format("%s%s%s%s#%s%s",
+        mkup.lnk_o,
+        heading_toc_.strip,
+        mkup.lnk_c,
+        mkup.url_o,
+        _anchor_tag,
+        mkup.url_c,
+      );
+      lev4_subtoc[tag_in_seg["seg_lv4"]]
+      ~= links_and_images(obj_["lev_markup_number"]
+           ~ "~ " ~ subtoc_txt_.to!string.strip
+         );
+      break;
+    default:
+      break;
+    }
+    ST_flow_table_of_contents_gather_headings ret;
+    {
+      ret.the_document_toc_section = the_document_toc_section;
+      ret.lev4_subtoc              = lev4_subtoc;
+    }
+    return ret;
+  }
+  invariant() {
+  }
+private:
+  static int[] heading_num = [ 0, 0, 0, 0 ];
+  static string heading_number_auto_composite = "";
+  static string heading_number_auto_composite_segname = "";
+  static bool[] auto_heading_numbering = [ true, true, true, true];
+  @safe static string _configured_auto_heading_numbering_and_segment_anchor_tags(CMM)(
+    string           munge_,
+    string[string]   obj_,
+    CMM              conf_make_meta,
+    bool             _new_doc,
+  ) {
+    if (_new_doc) {
+      heading_num                         = [ 0, 0, 0, 0 ];
+      heading_number_auto_composite       = "";
+      auto_heading_numbering              = [ true, true, true, true];
+    }
+    if (conf_make_meta.make.auto_num_top_lv) {
+      if (obj_["lev_markup_number"].to!int == 0) {
+        heading_num[0]                    = 0;
+        heading_num[1]                    = 0;
+        heading_num[2]                    = 0;
+        heading_num[3]                    = 0;
+        heading_number_auto_composite     = "";
+      }
+      // auto_num_depth minimum 0
+      // (1.) default 2 (1.1.1) max 3 (1.1.1.1) implement
+      if (
+        conf_make_meta.make.auto_num_top_lv
+        > obj_["lev_markup_number"].to!uint
+      ) {
+        heading_num[1]                    = 0;
+        heading_num[2]                    = 0;
+        heading_num[3]                    = 0;
+      } else if (
+        conf_make_meta.make.auto_num_top_lv
+          == obj_["lev_markup_number"].to!uint
+      ) {
+        auto_heading_numbering[0] =
+          (munge_.match(rgx.auto_heading_numbering_off_lv1)) ? false : true;
+        if (auto_heading_numbering[0]) {
+          heading_num[0] ++;
+        }
+        heading_num[1]                    = 0;
+        heading_num[2]                    = 0;
+        heading_num[3]                    = 0;
+      } else if (
+        conf_make_meta.make.auto_num_top_lv
+          == (obj_["lev_markup_number"].to!uint - 1)
+      ) {
+        auto_heading_numbering[1] =
+          (munge_.match(rgx.auto_heading_numbering_off_lv2)) ? false : true;
+        if (auto_heading_numbering[0]
+        && auto_heading_numbering[1]) {
+          heading_num[1] ++;
+        }
+        heading_num[2]                    = 0;
+        heading_num[3]                    = 0;
+      } else if (
+        conf_make_meta.make.auto_num_top_lv
+          == (obj_["lev_markup_number"].to!uint - 2)
+      ) {
+        auto_heading_numbering[2] =
+          (munge_.match(rgx.auto_heading_numbering_off_lv3)) ? false : true;
+        if (auto_heading_numbering[0]
+        && auto_heading_numbering[1]
+        && auto_heading_numbering[2]) {
+          heading_num[2] ++;
+        }
+        heading_num[3]                    = 0;
+      } else if (
+        conf_make_meta.make.auto_num_top_lv
+          == (obj_["lev_markup_number"].to!uint - 3)
+      ) {
+        auto_heading_numbering[3] =
+          (munge_.match(rgx.auto_heading_numbering_off_lv4)) ? false : true;
+        if (auto_heading_numbering[0]
+        && auto_heading_numbering[1]
+        && auto_heading_numbering[2]
+        && auto_heading_numbering[3]) {
+          heading_num[3] ++;
+        }
+      }
+      if (auto_heading_numbering[0]) {
+        if (heading_num[3] > 0) {
+          heading_number_auto_composite
+            = (conf_make_meta.make.auto_num_depth.to!uint == 3
+              && auto_heading_numbering[3])
+            ? (format(q"┃%s.%s.%s.%s┃",
+                heading_num[0].to!string,
+                heading_num[1].to!string,
+                heading_num[2].to!string,
+                heading_num[3].to!string
+              ))
+            : "";
+        } else if (heading_num[2] > 0) {
+          heading_number_auto_composite
+            = ((conf_make_meta.make.auto_num_depth.to!uint >= 2)
+              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
+              && auto_heading_numbering[2])
+            ? (format(q"┃%s.%s.%s┃",
+                heading_num[0].to!string,
+                heading_num[1].to!string,
+                heading_num[2].to!string
+              ))
+            : "";
+        } else if (heading_num[1] > 0) {
+          heading_number_auto_composite
+            = ((conf_make_meta.make.auto_num_depth.to!uint >= 1)
+              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
+              && auto_heading_numbering[1])
+            ? (format(q"┃%s.%s┃",
+                heading_num[0].to!string,
+                heading_num[1].to!string
+              ))
+            : "";
+        } else if (heading_num[0] > 0
+          && munge_.match(rgx.auto_heading_numbering_lv1)
+        ) {
+          heading_number_auto_composite
+            = ((conf_make_meta.make.auto_num_depth.to!uint >= 0)
+              && (conf_make_meta.make.auto_num_depth.to!uint <= 3)
+              && auto_heading_numbering[0])
+            ? (format(q"┃%s┃",
+                heading_num[0].to!string
+              ))
+            : "";
+        } else {
+          heading_number_auto_composite = "";
+        }
+      }
+      heading_number_auto_composite_segname =
+        (heading_number_auto_composite.empty)
+          ? ""
+          : "seg_" ~ heading_number_auto_composite;
+      debug(heading_number_auto) { writeln(heading_number_auto_composite); }
+      if ((!empty(heading_number_auto_composite))
+      && (obj_["lev_markup_number"].to!uint >= conf_make_meta.make.auto_num_top_lv)) {
+        munge_ = munge_
+        .replaceFirst(rgx.heading,
+          "$1~$2 " ~ heading_number_auto_composite ~ ". ")
+        .replaceFirst(rgx.heading_marker_missing_tag,
+          "$1~" ~ heading_number_auto_composite_segname ~ " ");
+      }
+    }
+    return munge_;
+  }
+  static int heading_num_lev1 = 0;
+  @safe static string _make_segment_anchor_tags_if_none_provided()(
+    string munge_,
+    string lev_,
+    bool   _new_doc
+  ) {
+    if (!(munge_.match(rgx.heading_anchor_tag))) {
+      if (lev_ == "A") { // (_new_doc)
+        heading_num_lev1 = 0;
+      }
+      if (munge_.match(rgx.heading_identify_anchor_tag)) {
+        if (auto m = munge_.match(rgx.heading_extract_named_anchor_tag)) {
+          munge_ = munge_.replaceFirst(
+            rgx.heading_marker_missing_tag,
+            "$1~" ~ m.captures[1].toLower ~ "_"  ~ m.captures[2] ~ " ");
+          if (auto n = munge_.match(rgx.heading_anchor_tag_plus_colon)) {
+            auto tag_remunge_ = n.captures[2]
+              .replaceAll(rgx.heading_marker_tag_has_colon, "..");
+            munge_ = munge_.replaceFirst(rgx.heading_anchor_tag_plus_colon, n.captures[1] ~ tag_remunge_ ~ " ");
+          }
+        } else if (auto m = munge_.match(rgx.heading_extract_unnamed_anchor_tag)) {
+          munge_ = munge_.replaceFirst(
+            rgx.heading_marker_missing_tag,
+            "$1~" ~ "s" ~ m.captures[1] ~ " ");
+        }
+      } else if (lev_ == "1") { // (if not successful) manufacture a unique anchor tag for lev == "1"
+        heading_num_lev1 ++;
+        munge_ = munge_.replaceFirst(
+          rgx.heading_marker_missing_tag,
+          "$1~" ~ "x" ~ heading_num_lev1.to!string ~ " ");
+      }
+    }
+    return munge_;
+  }
+}
+// ↑ - object inline markup
+#+END_SRC
+
+***** ϝ object attributes
+
+#+NAME: ocdaFunc_obj_attributes
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object attributes
+struct ObjAttributes {
+  string[string] _obj_attrib;
+  @safe string obj_attributes()(
+    string              obj_is_,
+    string              obj_raw,
+    ObjGenericComposite comp_obj_,
+  ) {
+    scope(exit) {
+      destroy(obj_is_);
+      destroy(obj_raw);
+      destroy(comp_obj_);
+    }
+    _obj_attrib["json"] ="{";
+    switch (obj_is_) {
+    case "heading":
+      _obj_attrib["json"] ~= txt_heading(obj_raw);
+      break;
+    case "para":
+      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
+      ~ txt_para(obj_raw);
+      break;
+    case "code":
+      _obj_attrib["json"] ~= txt_code(obj_raw);
+      break;
+    case "group":
+      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
+      ~ txt_group(obj_raw);
+      break;
+    case "block":
+      _obj_attrib["json"] ~= txt_para_and_blocks(obj_raw)
+      ~ txt_block(obj_raw);
+      break;
+    case "verse":
+      _obj_attrib["json"] ~= txt_verse(obj_raw);
+      break;
+    case "quote":
+      _obj_attrib["json"] ~= txt_quote(obj_raw);
+      break;
+    case "table":
+      _obj_attrib["json"] ~= txt_table(obj_raw);
+      break;
+    case "comment":
+      _obj_attrib["json"] ~= txt_comment(obj_raw);
+      break;
+    default:
+      _obj_attrib["json"] ~= txt_para(obj_raw);
+      break;
+    }
+    _obj_attrib["json"] ~= " }";
+    _obj_attrib["json"] = _set_additional_values_parse_as_json(_obj_attrib["json"], obj_is_, comp_obj_);
+    debug(structattrib) {
+      if (oa_j["is"].str() == "heading") {
+        writeln(_obj_attrib["json"]);
+        writeln(
+          "is: ", oa_j["is"].str(),
+          "; object_number: ", oa_j["object_number"].integer()
+        );
+      }
+    }
+    return _obj_attrib["json"];
+  }
+  invariant() {
+  }
+  private:
+  string _obj_attributes;
+  @safe string txt_para_and_blocks()(string obj_txt_in) {
+    if (obj_txt_in.matchFirst(rgx.para_bullet)) {
+      _obj_attributes =" \"bullet\": \"true\","
+      ~ " \"indent_hang\": 0,"
+      ~ " \"indent_base\": 0,";
+    } else if (auto m = obj_txt_in.matchFirst(rgx.para_bullet_indent)) {
+      _obj_attributes =" \"bullet\": \"true\","
+      ~ " \"indent_hang\": " ~ m["indent"].to!string ~ ","
+      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
+    } else if (auto m = obj_txt_in.matchFirst(rgx.para_indent_hang)) {
+      _obj_attributes =" \"bullet\": \"false\","
+      ~ " \"indent_hang\": " ~ m["hang"].to!string ~ ","
+      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
+    } else if (auto m = obj_txt_in.matchFirst(rgx.para_indent)) {
+      _obj_attributes =" \"bullet\": \"false\","
+      ~ " \"indent_hang\": " ~ m["indent"].to!string ~ ","
+      ~ " \"indent_base\": " ~ m["indent"].to!string ~ ",";
+    } else {
+      _obj_attributes =" \"bullet\": \"false\","
+      ~ " \"indent_hang\": 0,"
+      ~ " \"indent_base\": 0,";
+    }
+    return _obj_attributes;
+  }
+  @safe string txt_heading()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"para\","
+    ~ " \"is\": \"heading\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_para()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"para\","
+    ~ " \"is\": \"para\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_quote()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"quote\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_group()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"group\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_block()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"block\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_verse()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"verse\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_code()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"code\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_table()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"content\","
+    ~ " \"of\": \"block\","
+    ~ " \"is\": \"table\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string txt_comment()(string obj_txt_in) {
+    _obj_attributes = " \"use\": \"comment\","
+    ~ " \"of\": \"comment\","
+    ~ " \"is\": \"comment\"";
+    return _obj_attributes;
+  }
+  invariant() {
+  }
+  @safe string _set_additional_values_parse_as_json()(
+    string              _obj_attrib,
+    string              obj_is_,
+    ObjGenericComposite comp_obj_,
+  ) {
+    JSONValue oa_j = parseJSON(_obj_attrib);
+    assert(
+      (oa_j.type == JSON_TYPE.OBJECT)
+    );
+    if (obj_is_ == "heading") {
+      oa_j.object["object_number"]              = comp_obj_.metainfo.ocn;
+      oa_j.object["lev_markup_number"]          = comp_obj_.metainfo.heading_lev_markup;
+      oa_j.object["lev_collapsed_number"]       = comp_obj_.metainfo.heading_lev_collapsed;
+      oa_j.object["heading_ptr"]                = comp_obj_.ptr.heading;
+      oa_j.object["doc_object_ptr"]             = comp_obj_.ptr.doc_object;
+    }
+    oa_j.object["parent_object_number"]         = comp_obj_.metainfo.parent_ocn;
+    oa_j.object["parent_lev_markup_number"]     = comp_obj_.metainfo.parent_lev_markup;
+    _obj_attrib                                 = oa_j.toString();
+    return _obj_attrib;
+  }
+}
+// ↑ - object attributes
+#+END_SRC
+
+***** ϝ object level tags
+
+#+NAME: ocdaFunc_obj_set_markup_level_tags
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - object tags
+@safe pure ObjGenericComposite obj_dom_structure_set_markup_tags()(
+  ObjGenericComposite  obj,
+  int[]                dom,
+  int                  lev
+) {
+  foreach (i; 0 .. 8) {
+    if (i < lev) {
+      if (dom[i] == DomTags.open
+         || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.open_still;
+      } else if (dom[i] == DomTags.close) {
+        dom[i] = DomTags.none;
+      }
+    } else if (i == lev) {
+      if (lev  == 0
+        && dom[i] == DomTags.open_still
+      ) {
+        dom[i] = DomTags.close;
+      } else if (dom[i] == DomTags.open
+        || dom[i] == DomTags.open_still
+        || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.close_and_open;
+      } else {
+        dom[i] = DomTags.open;
+      }
+    } else if (i > lev) {
+      if (dom[i] == DomTags.close) {
+        dom[i] = DomTags.none;
+      } else if (dom[i] == DomTags.open
+        || dom[i] == DomTags.open_still
+        || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.close;
+      }
+    }
+  }
+  debug(dom_magic_numbers) { writeln("marked up: ", lev, ": ", dom); }
+  obj.metainfo.dom_structure_markedup_tags_status = dom.dup;
+  return obj;
+}
+@safe pure ObjGenericComposite obj_dom_set_collapsed_tags()(
+  ObjGenericComposite  obj,
+  int[]                dom,
+  int                  lev
+) {
+  foreach (i; 0 .. 8) {
+    if (i < lev) {
+      if (dom[i] == DomTags.open
+         || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.open_still;
+      } else if (dom[i] == DomTags.close) {
+        dom[i] = DomTags.none;
+      }
+    } else if (i == lev) {
+      if (lev  == 0
+        && dom[i] == DomTags.open_still
+      ) {
+        dom[i] = DomTags.close;
+      } else if (dom[i] == DomTags.open
+        || dom[i] == DomTags.open_still
+        || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.close_and_open;
+      } else {
+        dom[i] = DomTags.open;
+      }
+    } else if (i > lev) {
+      if (dom[i] == DomTags.close) {
+        dom[i] = DomTags.none;
+      } else if (dom[i] == DomTags.open
+        || dom[i] == DomTags.open_still
+        || dom[i] == DomTags.close_and_open
+      ) {
+        dom[i] = DomTags.close;
+      }
+    }
+  }
+  debug(dom_magic_numbers) { writeln("collapsed: ", lev, ": ", dom); }
+  obj.metainfo.dom_structure_collapsed_tags_status = dom.dup;
+  return obj;
+}
+// ↑ - object tags
+#+END_SRC
+
+**** ϝ section
+***** ϝ section toc - table of contents
+
+#+NAME: ocdaFunc_section_toc
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - table of contents
+@system ObjGenericComposite[] backmatter_gather_table_of_contents(
+  ObjGenericComposite[] the_document_endnotes_section,
+  ObjGenericComposite[] the_document_glossary_section,
+  ObjGenericComposite[] the_document_bibliography_section,
+  ObjGenericComposite[] the_document_bookindex_section,
+  ObjGenericComposite[] the_document_blurb_section,
+) {
+  ObjGenericComposite[] toc_section_backmatter;
+  string toc_txt_;
+  static auto mkup = InlineMarkup();
+  ObjGenericComposite   comp_obj_;
+  int[string] indent = [
+    "hang_position" : 1,
+    "base_position" : 1,
+  ];
+  comp_obj_                                          = set_object_generic("frontmatter", "toc", "para", "toc", "", 0);
+  comp_obj_.metainfo.identifier                      = "";
+  comp_obj_.metainfo.object_number_off               = true;
+  comp_obj_.metainfo.object_number_type              = 0;
+  comp_obj_.attrib.indent_hang                       = indent["hang_position"];
+  comp_obj_.attrib.indent_base                       = indent["base_position"];
+  comp_obj_.attrib.bullet                            = false;
+  if (the_document_endnotes_section.length > 1) {
+    toc_txt_ = format("%s%s%s%s#%s%s",
+      mkup.lnk_o,
+      "Endnotes",
+      mkup.lnk_c,
+      mkup.url_o,
+      "endnotes",
+      mkup.url_c,
+    );
+    toc_txt_= toc_txt_.links_and_images;
+    comp_obj_.text                                   = toc_txt_.to!string.strip;
+    comp_obj_.has.inline_links                       = true;
+    toc_section_backmatter                           ~= comp_obj_;
+  }
+  if (the_document_glossary_section.length > 1) {
+    toc_txt_ = format("%s%s%s%s#%s%s",
+      mkup.lnk_o,
+      "Glossary",
+      mkup.lnk_c,
+      mkup.url_o,
+      "glossary",
+      mkup.url_c,
+    );
+    toc_txt_= toc_txt_.links_and_images;
+    comp_obj_.text                                   = toc_txt_.to!string.strip;
+    comp_obj_.has.inline_links                       = true;
+    toc_section_backmatter                           ~= comp_obj_;
+  }
+  if (the_document_bibliography_section.length > 1){
+    toc_txt_ = format("%s%s%s%s#%s%s",
+      mkup.lnk_o,
+      "Bibliography",
+      mkup.lnk_c,
+      mkup.url_o,
+      "bibliography",
+      mkup.url_c,
+    );
+    toc_txt_= toc_txt_.links_and_images;
+    comp_obj_.text                                   = toc_txt_.to!string.strip;
+    comp_obj_.has.inline_links                       = true;
+    toc_section_backmatter                           ~= comp_obj_;
+  }
+  if (the_document_bookindex_section.length > 1) {
+    toc_txt_ = format("%s%s%s%s#%s%s",
+      mkup.lnk_o,
+      "Book Index",
+      mkup.lnk_c,
+      mkup.url_o,
+      "bookindex",
+      mkup.url_c,
+    );
+    toc_txt_= toc_txt_.links_and_images;
+    comp_obj_.text                                   = toc_txt_.to!string.strip;
+    comp_obj_.has.inline_links                       = true;
+    toc_section_backmatter                           ~= comp_obj_;
+  }
+  if (the_document_blurb_section.length > 1) {
+    toc_txt_ = format("%s%s%s%s#%s%s",
+      mkup.lnk_o,
+      "Blurb",
+      mkup.lnk_c,
+      mkup.url_o,
+      "blurb",
+      mkup.url_c,
+    );
+    toc_txt_= toc_txt_.links_and_images;
+    comp_obj_.has.inline_links                       = true;
+    comp_obj_.text                                   = toc_txt_.to!string.strip;
+    toc_section_backmatter                           ~= comp_obj_;
+  }
+  debug(toc) {
+    writefln( "%s %s", __LINE__,);
+    foreach (toc_linked_heading; toc_section_backmatter) {
+      writeln(mkup.indent_by_spaces_provided(toc_linked_heading.attrib.indent_hang), toc_linked_heading.text);
+    }
+  }
+  return toc_section_backmatter;
+}
+// ↑ - table of contents
+#+END_SRC
+
+***** ϝ section endnotes
+
+#+NAME: ocdaFunc_section_endnotes
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - endnotes
+struct NotesSection {
+  string[string] object_notes;
+  int previous_count;
+  int mkn;
+  static auto rgx = RgxI();
+  @safe private auto gather_notes_for_endnote_section(
+    ObjGenericComposite[] contents_am,
+    string[string]        tag_in_seg,
+    int                   cntr,
+  ) {
+    assert((contents_am[cntr].metainfo.is_a == "para")
+    || (contents_am[cntr].metainfo.is_a     == "heading")
+    || (contents_am[cntr].metainfo.is_a     == "quote")
+    || (contents_am[cntr].metainfo.is_a     == "group")
+    || (contents_am[cntr].metainfo.is_a     == "block")
+    || (contents_am[cntr].metainfo.is_a     == "verse"));
+    assert(cntr >= previous_count);
+    assert(
+      (contents_am[cntr].text).match(
+      rgx.inline_notes_al_all_note)
+    );
+    mixin InternalMarkup;
+    previous_count = cntr;
+    static auto mkup = InlineMarkup();
+    static auto munge = ObjInlineMarkupMunge();
+    foreach(m;
+      (contents_am[cntr].text).matchAll(
+        rgx.inline_notes_al_special_char_note)
+    ) {
+      debug(endnotes_build) { writeln(
+          "{", mkup.ff_i, mkup.superscript, mkup.ff_o, m["char"], ".", mkup.ff_c, mkup.superscript, "}"
+          ~ mkup.mark_internal_site_lnk,
+          tag_in_seg["seg_lv4"],
+            ".fnSuffix#noteref_\n  ", m["char"], " ",
+          m["note"]); // sometimes need segment name (segmented html & epub)
+      }
+      // you need anchor for segments at this point ->
+      object_notes["anchor"] ~= "note_" ~ m["char"] ~ "』";
+      object_notes["notes"]  ~= (tag_in_seg["seg_lv4"].empty)
+      ? (links_and_images(
+          "{" ~ mkup.ff_i ~ mkup.superscript  ~ mkup.ff_o ~ m["char"] ~ "." ~ mkup.ff_c  ~ mkup.superscript  ~ "}#noteref_"
+          ~ m["char"]) ~ " "
+          ~ m["note"] ~ "』"
+        )
+      : (links_and_images(
+          "{" ~ mkup.ff_i ~ mkup.superscript ~ mkup.ff_o ~ m["char"] ~ "." ~ mkup.ff_c  ~ mkup.superscript ~ "}"
+           ~ mkup.mark_internal_site_lnk
+           ~ tag_in_seg["seg_lv4"]
+           ~ ".fnSuffix#noteref_"
+           ~ m["char"]) ~ " "
+           ~ m["note"] ~ "』"
+        );
+    }
+    foreach(m;
+      (contents_am[cntr].text).matchAll(
+        rgx.inline_notes_al_regular_number_note)
+    ) {
+      debug(endnotes_build) { writeln(
+          "{", mkup.ff_i, mkup.superscipt, mkup.ff_o, m["num"], ".", mkup.ff_c, mkup.superscipt, "}"
+          ~ mkup.mark_internal_site_lnk,
+          tag_in_seg["seg_lv4"],
+            ".fnSuffix#noteref_\n  ", m["num"], " ",
+          m["note"]); // sometimes need segment name (segmented html & epub)
+      }
+      // you need anchor for segments at this point ->
+      object_notes["anchor"] ~= "note_" ~ m["num"] ~ "』";
+      object_notes["notes"]  ~= (tag_in_seg["seg_lv4"].empty)
+      ? (links_and_images(
+          "{" ~ mkup.ff_i ~ mkup.superscript  ~ mkup.ff_o ~ m["num"] ~ "." ~ mkup.ff_c  ~ mkup.superscript  ~ "}#noteref_"
+          ~ m["num"]) ~ " "
+          ~ m["note"] ~ "』"
+        )
+      : (links_and_images(
+          "{" ~ mkup.ff_i ~ mkup.superscript ~ mkup.ff_o ~ m["num"] ~ "." ~ mkup.ff_c  ~ mkup.superscript ~ "}"
+           ~ mkup.mark_internal_site_lnk
+           ~ tag_in_seg["seg_lv4"]
+           ~ ".fnSuffix#noteref_"
+           ~ m["num"]) ~ " "
+           ~ m["note"] ~ "』"
+        );
+    }
+    return object_notes;
+  }
+  @safe private auto gathered_notes() {
+    string[][string] endnotes_;
+    if (object_notes.length > 1) {
+      endnotes_["notes"] = (object_notes["notes"].split(rgx.break_string))[0..$-1];
+      endnotes_["anchor"] = (object_notes["anchor"].split(rgx.break_string))[0..$-1];
+    } else {
+      endnotes_["notes"] = [];
+      endnotes_["anchor"] = [];
+    }
+    return endnotes_;
+  }
+  @safe private ST_endnotes backmatter_endnote_objects(O)(
+    OCNset         obj_cite_digits,
+    O              opt_action,
+  ) {
+    mixin spineNode;
+    ObjGenericComposite[] the_document_endnotes_section;
+    auto endnotes_ = gathered_notes();
+    string type_is;
+    string lev, lev_markup_number, lev_collapsed_number;
+    string attrib;
+    int[string] indent;
+    ObjGenericComposite comp_obj_;
+    if ((endnotes_["notes"].length > 0)
+    && (opt_action.backmatter && opt_action.section_endnotes)) {
+      {
+        comp_obj_                                     = set_object_heading("lev1", "backmatter", "endnotes", "Endnotes");
+        comp_obj_.metainfo.identifier                 = "";
+        comp_obj_.metainfo.dummy_heading              = false;
+        comp_obj_.metainfo.object_number_off          = false;
+        comp_obj_.metainfo.object_number_type         = 0;
+        comp_obj_.tags.segment_anchor_tag_epub        = "_part_endnotes";
+        comp_obj_.tags.anchor_tag_html                = comp_obj_.tags.segment_anchor_tag_epub;
+        comp_obj_.tags.in_segment_html                = "endnotes";
+        comp_obj_.tags.anchor_tags                    = ["section_endnotes"];
+        the_document_endnotes_section                 ~= comp_obj_;
+        tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+        tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+        ++mkn;
+      }
+      {
+        comp_obj_                                     = set_object_heading("lev4", "backmatter", "endnotes", "Endnotes");
+        comp_obj_.metainfo.identifier                 = "";
+        comp_obj_.metainfo.dummy_heading              = true;
+        comp_obj_.metainfo.object_number_off          = true;
+        comp_obj_.metainfo.object_number_type         = 0;
+        comp_obj_.tags.segment_anchor_tag_epub        = "endnotes";
+        comp_obj_.tags.anchor_tag_html                = comp_obj_.tags.segment_anchor_tag_epub;
+        comp_obj_.tags.in_segment_html                = comp_obj_.tags.anchor_tag_html;
+        comp_obj_.tags.anchor_tags                    = ["endnotes"];
+        the_document_endnotes_section                 ~= comp_obj_;
+        tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+        tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+        ++mkn;
+      }
+    } else {
+      comp_obj_                                       = set_object_heading("lev1", "empty", "empty", "(skip) there are no Endnotes");
+      comp_obj_.metainfo.identifier                   = "";
+      comp_obj_.metainfo.dummy_heading                = true;
+      comp_obj_.metainfo.object_number_off            = true;
+      comp_obj_.metainfo.object_number_type           = 0;
+      the_document_endnotes_section                   ~= comp_obj_;
+    }
+    if (opt_action.backmatter && opt_action.section_endnotes) {
+      ObjGenericComposite comp_obj_endnote_;
+      comp_obj_endnote_                                       = set_object_generic("backmatter", "endnotes", "para", "endnote", "", 0);
+      comp_obj_endnote_.metainfo.identifier                   = "";
+      // comp_obj_.metainfo.dummy_heading                     = false;
+      comp_obj_.metainfo.object_number_off                    = true;
+      comp_obj_.metainfo.object_number_type                   = 0;
+      comp_obj_endnote_.attrib.indent_hang                    = 0;
+      comp_obj_endnote_.attrib.indent_base                    = 0;
+      comp_obj_endnote_.attrib.bullet                         = false;
+      foreach (i, endnote; endnotes_["notes"]) {
+        auto     m                                            = endnote.matchFirst(rgx.note_ref);
+        string   notenumber                                   = m["ref"].to!string;
+        string   anchor_tag                                   = "note_" ~ notenumber;
+        comp_obj_endnote_.tags.anchor_tags                    = [ endnotes_["anchor"][i] ];
+        comp_obj_endnote_.has.inline_links                    = true;
+        comp_obj_endnote_.text                                = endnote.inline_markup_faces.strip;
+        the_document_endnotes_section                         ~= comp_obj_endnote_;
+      }
+    }
+    ST_endnotes ret;
+    {
+      ret.endnotes = the_document_endnotes_section;
+      ret.ocn      = obj_cite_digits;
+    }
+    return ret;
+  }
+}
+// ↑ - endnotes
+#+END_SRC
+
+***** ϝ section book index
+
+#+NAME: ocdaFunc_section_book_index
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - section book index
+@system ST_flow_book_index flow_book_index_(B)(
+  char[]          line,
+  string[string]  an_object,
+  string          book_idx_tmp,
+  uint[string]    pith,
+  B               opt_action,
+) {
+  static auto rgx = RgxI();
+  if (auto m = line.match(rgx.book_index_item)) {                                   // match book_index
+    debug(bookindexmatch) { writefln(
+        "* [bookindex] %s\n",
+        m["bookindex"].to!string,
+      );
+    }
+    an_object["bookindex_nugget"] = m.captures[1].to!string;
+  } else if (auto m = line.match(rgx.book_index_item_open))  {                      // match open book_index
+    pith["section"] = eN.sect.book_index;
+    if (opt_action.backmatter && opt_action.section_bookindex) {
+      book_idx_tmp = m.captures[1].to!string;
+      debug(bookindexmatch) { writefln( "* [bookindex] %s\n", book_idx_tmp,); }
+    }
+  } else if (pith["section"] == eN.sect.book_index)  {                    // book_index flag set
+    if (auto m = line.match(rgx.book_index_item_close))  {
+      pith["section"] = eN.sect.unset;
+      if (opt_action.backmatter
+      && opt_action.section_bookindex) {
+        an_object["bookindex_nugget"] = book_idx_tmp ~ m.captures[1].to!string;
+        debug(bookindexmatch) { writefln( "* [bookindex] %s\n", book_idx_tmp,); }
+      }
+      book_idx_tmp = "";
+    } else {
+      if (opt_action.backmatter
+      && opt_action.section_bookindex) {
+        book_idx_tmp ~= line;
+      }
+    }
+  }
+  ST_flow_book_index ret;
+  {
+    ret.this_object    = an_object;
+    ret.pith           = pith;
+    ret.book_idx_tmp   = book_idx_tmp;
+  }
+  return ret;
+}
+struct BookIndexNuggetHash {
+  string main_term, sub_term, sub_term_bits;
+  int object_number_offset, object_number_endpoint;
+  string[] object_numbers;
+  string[][string][string] bi_hash_nugget;
+  string[] bi_main_terms_split_arr;
+  @safe string[][string][string] bookindex_nugget_hash(S)(
+    string bookindex_section,
+    OCNset obj_cite_digits,
+    S      tag_in_seg,
+  ) {
+    debug(asserts) { static assert(is(typeof(obj_cite_digits.object_number) == int)); }
+    debug(bookindexraw) {
+      if (!bookindex_section.empty) {
+        writeln(
+          "* [bookindex] ",
+          "[", obj_cite_digits.object_number.to!string, ": ", tag_in_seg["seg_lv4"], "] ", bookindex_section,
+          "  - - - ",
+          "[", obj_cite_digits.object_number.to!string, "] ", bookindex_section
+        );
+      }
+    }
+    static auto rgx = RgxI();
+    if (!bookindex_section.empty) {
+      auto bi_main_terms_split_arr
+        = bookindex_section.split(rgx.bi_main_terms_split);
+      foreach (bi_main_terms_content; bi_main_terms_split_arr) {
+        auto bi_main_term_and_rest
+          = bi_main_terms_content.split(rgx.bi_main_term_plus_rest_split);
+        if (auto m = bi_main_term_and_rest[0].match(
+          rgx.bi_term_and_object_numbers_match)
+        ) {
+          main_term = m.captures[1].strip;
+          object_number_offset = m.captures[2].to!int;
+          object_number_endpoint = (obj_cite_digits.object_number + object_number_offset);
+          object_numbers ~= (obj_cite_digits.object_number.to!string
+          ~ "-" ~ object_number_endpoint.to!string);
+        } else {
+          main_term = bi_main_term_and_rest[0].strip;
+          object_numbers ~= obj_cite_digits.object_number.to!string;
+        }
+        bi_hash_nugget[main_term]["_a"] ~= object_numbers;
+        object_numbers = null;
+        if (bi_main_term_and_rest.length > 1) {
+          auto bi_sub_terms_split_arr
+            = bi_main_term_and_rest[1].split(
+              rgx.bi_sub_terms_plus_object_number_offset_split
+            );
+          foreach (sub_terms_bits; bi_sub_terms_split_arr) {
+            if (auto m = sub_terms_bits.match(rgx.bi_term_and_object_numbers_match)) {
+              sub_term = m.captures[1].strip;
+              object_number_offset = m.captures[2].to!int;
+              object_number_endpoint = (obj_cite_digits.object_number + object_number_offset);
+              object_numbers ~= (obj_cite_digits.object_number.to!string
+              ~ " - " ~ object_number_endpoint.to!string);
+            } else {
+              sub_term = sub_terms_bits.strip;
+              object_numbers ~= obj_cite_digits.object_number.to!string;
+            }
+            if (!empty(sub_term)) {
+              bi_hash_nugget[main_term][sub_term] ~= object_numbers;
+            }
+            object_numbers = null;
+          }
+        }
+      }
+    }
+    return bi_hash_nugget;
+  }
+  invariant() {
+  }
+}
+struct BookIndexReportIndent {
+  int mkn, skn;
+  @safe void bookindex_report_indented()(
+    string[][string][string] bookindex_unordered_hashes
+  ) {
+    auto mainkeys
+      = bookindex_unordered_hashes.byKey.array.sort().release;
+    foreach (mainkey; mainkeys) {
+      debug(bookindex1) { writeln(mainkey); }
+      auto subkeys
+        = bookindex_unordered_hashes[mainkey].byKey.array.sort().release;
+      foreach (subkey; subkeys) {
+        debug(bookindex1) {
+          writeln("  ", subkey);
+          writeln("    ", to!string(
+            bookindex_unordered_hashes[mainkey][subkey]
+          ));
+        }
+        ++skn;
+      }
+      ++mkn;
+    }
+  }
+}
+struct BookIndexReportSection {
+  int  mkn, skn;
+  static auto rgx = RgxI();
+  static auto munge = ObjInlineMarkupMunge();
+  @safe void bookindex_write_section()(
+    string[][string][string] bookindex_unordered_hashes
+  ) {
+    auto mainkeys =
+      bookindex_unordered_hashes.byKey.array
+      .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
+    foreach (mainkey; mainkeys) {
+      write("_0_1 ⑆!┨", mainkey, "┣! ");
+      foreach (ref_; bookindex_unordered_hashes[mainkey]["_a"]) {
+        auto go = ref_.replaceAll(rgx.book_index_go, "$1");
+        write(" {", ref_, "}#", go, ", ");
+      }
+      writeln(" \\\\");
+      bookindex_unordered_hashes[mainkey].remove("_a");
+      auto subkeys =
+        bookindex_unordered_hashes[mainkey].byKey.array
+        .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
+      foreach (subkey; subkeys) {
+        write("  ", subkey, ", ");
+        foreach (ref_; bookindex_unordered_hashes[mainkey][subkey]) {
+          auto go = ref_.replaceAll(rgx.book_index_go, "$1");
+          write(" {", ref_, "}#", go, ", ");
+        }
+        writeln(" \\\\");
+        ++skn;
+      }
+      ++mkn;
+    }
+  }
+  @system ST_bookindex backmatter_bookindex_build_abstraction_section(B)(
+    string[][string][string] bookindex_unordered_hashes,
+    OCNset                   obj_cite_digits,
+    B                        opt_action,
+  ) {
+    debug(asserts) { static assert(is(typeof(obj_cite_digits.object_number) == int)); }
+    mixin spineNode;
+    mixin InternalMarkup;
+    static auto mkup = InlineMarkup();
+    string type_is;
+    string lev;
+    int heading_lev_markup, heading_lev_collapsed;
+    string attrib;
+    int[string] indent;
+    auto mainkeys =
+      bookindex_unordered_hashes.byKey.array
+      .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
+    ObjGenericComposite[] bookindex_section;
+    ObjGenericComposite comp_obj_;
+    auto node_para_int_ = node_metadata_para_int;
+    auto node_para_str_ = node_metadata_para_str;
+    if ((mainkeys.length > 0)
+    && (opt_action.backmatter
+    && opt_action.section_bookindex)) {
+      string bi_tmp;
+      string[] bi_tmp_tags;
+      {
+        comp_obj_                                     =  set_object_heading("lev1", "backmatter", "bookindex", "Book Index");
+        comp_obj_.metainfo.identifier                 = "";
+        comp_obj_.metainfo.dummy_heading              = false;
+        comp_obj_.metainfo.object_number_off          = false;
+        comp_obj_.metainfo.object_number_type         = 0;
+        comp_obj_.tags.segment_anchor_tag_epub        = "_part_book_index";
+        comp_obj_.tags.anchor_tag_html                = comp_obj_.tags.segment_anchor_tag_epub;
+        comp_obj_.tags.in_segment_html                = "bookindex";
+        comp_obj_.tags.anchor_tags                    = ["section_bookindex"];
+        comp_obj_.has.inline_links                    = true;
+        bookindex_section                             ~= comp_obj_;
+        tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+        tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+        ++mkn;
+      }
+      {
+        comp_obj_                                     = set_object_heading("lev4", "backmatter", "bookindex", "Index");
+        comp_obj_.metainfo.identifier                 = "";
+        comp_obj_.metainfo.dummy_heading              = true;
+        comp_obj_.metainfo.object_number_off          = true;
+        comp_obj_.metainfo.object_number_type         = 0;
+        comp_obj_.tags.segment_anchor_tag_epub        = "bookindex";
+        comp_obj_.tags.anchor_tag_html                = comp_obj_.tags.segment_anchor_tag_epub;
+        comp_obj_.tags.in_segment_html                = comp_obj_.tags.anchor_tag_html;
+        comp_obj_.metainfo.heading_lev_collapsed      = 2;
+        comp_obj_.has.inline_links                    = false;
+        comp_obj_.tags.anchor_tags                    = ["bookindex"];
+        bookindex_section                             ~= comp_obj_;
+        tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+        tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+        ++mkn;
+      }
+      import std.array : appender;
+      auto buffer = appender!(char[])();
+      string[dchar] transTable = [' ' : "_"];
+      foreach (mainkey; mainkeys) {
+        bi_tmp_tags = [""];
+        bi_tmp = mkup.ff_i ~ mkup.bold ~ mkup.ff_o ~ mainkey ~ mkup.ff_c ~ mkup.bold ~ " ";
+        buffer.clear();
+        bi_tmp_tags ~= translate(mainkey, transTable);
+        auto bkidx_lnk(string locs) {
+          string markup = "";
+          if (auto m = locs.matchFirst(rgx.book_index_go)) {
+            markup
+              = links_and_images("{ " ~ m["link"] ~ " }"
+              ~ "#" ~ m["ocn"] ~ ", ");
+          } else {
+            writeln(__LINE__, ": ", locs);
+          }
+          return markup;
+        }
+        foreach (ref_; bookindex_unordered_hashes[mainkey]["_a"]) {
+          bi_tmp ~= bkidx_lnk(ref_);
+        }
+        bi_tmp ~= " \\\\\n    ";
+        bookindex_unordered_hashes[mainkey].remove("_a");
+        auto subkeys =
+          bookindex_unordered_hashes[mainkey].byKey.array
+          .sort!("toUpper(a) < toUpper(b)", SwapStrategy.stable).release;
+        foreach (subkey; subkeys) {
+          bi_tmp ~= subkey ~ ", ";
+          buffer.clear();
+          bi_tmp_tags ~= translate(subkey, transTable);
+          foreach (ref_; bookindex_unordered_hashes[mainkey][subkey]) {
+            bi_tmp ~= bkidx_lnk(ref_);
+          }
+          bi_tmp ~= " \\\\\n    ";
+          ++skn;
+        }
+        bi_tmp                                             = bi_tmp.replaceFirst(rgx.trailing_linebreak, "");
+        comp_obj_                                          = set_object_generic("backmatter", "bookindex", "para", "bookindex", bi_tmp.to!string.strip, 0);
+        comp_obj_.metainfo.identifier                      = "";
+        comp_obj_.metainfo.object_number_off               = true;
+        comp_obj_.metainfo.object_number_type              = 0;
+        comp_obj_.tags.anchor_tags                         = bi_tmp_tags;
+        comp_obj_.attrib.indent_hang                       = 0;
+        comp_obj_.attrib.indent_base                       = 1;
+        comp_obj_.attrib.bullet                            = false;
+        comp_obj_.has.inline_links                         = true;
+        comp_obj_.text                                     = bi_tmp.to!string.strip;
+        bookindex_section                                  ~= comp_obj_;
+        ++mkn;
+      }
+    } else {                              // no book index, (figure out what to do here)
+      comp_obj_                                       = set_object_heading("lev1", "backmatter", "bookindex", "(skip) there is no Book Index");
+      comp_obj_.metainfo.identifier                   = "";
+      comp_obj_.metainfo.dummy_heading                = true;
+      comp_obj_.metainfo.object_number_off            = true;
+      bookindex_section                               ~= comp_obj_;
+    }
+    ST_bookindex ret;
+    {
+      ret.bookindex = bookindex_section;
+      ret.ocn       = obj_cite_digits;
+    }
+    return ret;
+  }
+}
+// ↑ - section book index
+#+END_SRC
+
+***** ϝ section glossary
+
+#+NAME: ocdaFunc_section_glossary
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - section glossary
+// ↓ build
+ST_the_section build_the_glossary_section(
+  char[]                 line,             // line is immutable, not necessary to return unchanged
+  uint[string]           pith,             // double check, should not be necessary to pass pith
+  string[string][string] tag_assoc,        // only for headings: html & epub
+) {
+  static auto rgx = RgxI();
+  ObjGenericComposite comp_obj_;
+  ObjGenericComposite[] add_to_current_document_section;
+  indent = [
+    "hang_position" : 0,
+    "base_position" : 0,
+  ];
+  bullet = false;
+  pith["txt_is"]           = eN.txt_is.para;
+  line_occur["para"]       = eN.bi.off;
+  an_object_key            = "glossary_nugget";
+  ST_the_section ret;
+  if (line.matchFirst(rgx.heading_glossary)) {
+    {
+      comp_obj_                                = set_object_heading("lev1", "backmatter", "glossary", "Glossary");
+      comp_obj_.metainfo.identifier            = "";
+      comp_obj_.metainfo.dummy_heading         = false;
+      comp_obj_.metainfo.object_number_off     = false;
+      comp_obj_.metainfo.object_number_type    = 0;
+      comp_obj_.tags.segment_anchor_tag_epub   = "_part_glossary";
+      comp_obj_.tags.anchor_tag_html           = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html           = "glossary";
+      comp_obj_.tags.anchor_tags               = ["section_glossary"];
+      comp_obj_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      comp_obj_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      add_to_current_document_section           ~= comp_obj_; //
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    } {
+      comp_obj_                                = set_object_heading("lev4", "backmatter", "glossary", "Glossary");
+      comp_obj_.metainfo.identifier            = "";
+      comp_obj_.metainfo.dummy_heading         = true;
+      comp_obj_.metainfo.object_number_off     = true;
+      comp_obj_.metainfo.object_number_type    = 0;
+      comp_obj_.tags.segment_anchor_tag_epub   = "glossary";
+      comp_obj_.tags.anchor_tag_html           = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html           = comp_obj_.tags.anchor_tag_html;
+      comp_obj_.metainfo.heading_lev_collapsed = 2;
+      comp_obj_.tags.anchor_tags               = ["glossary"];
+      add_to_current_document_section          ~= comp_obj_; //
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+      pith["ocn"] = eN.ocn.on;
+    }
+    {
+      ret.comp_section_obj         ~= add_to_current_document_section;
+      ret.pith                     = pith;
+      ret.tag_assoc                = tag_assoc; // only for headings: html & epub
+    }
+  } else { // para
+    {
+      auto _get = line.flow_para_match_(an_object, an_object_key, indent, bullet, pith, line_occur);
+      {
+        an_object     = _get.this_object;
+        an_object_key = _get.this_object_key;
+        pith          = _get.pith;
+        indent        = _get.indent;
+        bullet        = _get.bullet;
+        line_occur    = _get.line_occur;
+      }
+    }
+    comp_obj_                               = set_object_generic("backmatter", "glossary", "para", "glossary", links_and_images(line.to!string.strip).replaceFirst(rgx.para_attribs, ""), 0);
+    comp_obj_.metainfo.identifier           = "";
+    comp_obj_.metainfo.object_number_off    = true;
+    comp_obj_.metainfo.object_number_type   = 0;
+    comp_obj_.attrib.indent_hang            = indent["hang_position"];
+    comp_obj_.attrib.indent_base            = indent["base_position"];
+    comp_obj_.attrib.bullet                 = bullet;
+    add_to_current_document_section         ~= comp_obj_; //
+    pith["ocn"]                             = eN.ocn.on;
+    {
+      ret.comp_section_obj = add_to_current_document_section;
+      ret.pith             = pith;
+      ret.tag_assoc        = tag_assoc; // NO CHANGE here, only for headings: html & epub
+    }
+  }
+  return ret;
+}
+// ↑ - section glossary
+#+END_SRC
+
+***** ϝ section bibliography
+
+#+NAME: ocdaFunc_section_bibliography
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - section bibliography
+@system ST_biblio_section backmatter_make_the_bibliography_section()(
+  string[]     biblio_unsorted_incomplete,
+  JSONValue[]  bib_arr_json,
+) {
+  Bibliography biblio = Bibliography();
+  ObjGenericComposite comp_obj_;
+  static auto mkup = InlineMarkup();
+  ST_flow_bibliography _get = biblio.flow_bibliography_(biblio_unsorted_incomplete, bib_arr_json);
+  JSONValue[] biblio_ordered;
+  biblio_ordered            = _get.biblio_sorted;
+  if (biblio_ordered.length > 0) {
+    {
+      comp_obj_                                 = set_object_heading("lev1", "backmatter", "bibliography", "Bibliography");
+      comp_obj_.metainfo.identifier             = "";
+      comp_obj_.metainfo.dummy_heading          = false;
+      comp_obj_.metainfo.object_number_off      = false;
+      comp_obj_.metainfo.object_number_type     = 0;
+      comp_obj_.tags.segment_anchor_tag_epub    = "_part_bibliography";
+      comp_obj_.tags.anchor_tag_html            = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html            = "bibliography";
+      comp_obj_.tags.anchor_tags                = ["section_bibliography"];
+      comp_obj_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      comp_obj_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      the_document_bibliography_section         ~= comp_obj_;
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    }
+    {
+      comp_obj_                                 = set_object_heading("lev4", "backmatter", "bibliography", "Bibliography");
+      comp_obj_.metainfo.identifier             = "";
+      comp_obj_.metainfo.dummy_heading          = true;
+      comp_obj_.metainfo.object_number_off      = true;
+      comp_obj_.metainfo.object_number_type     = 0;
+      comp_obj_.tags.segment_anchor_tag_epub    = "bibliography";
+      comp_obj_.tags.anchor_tag_html            = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html            = comp_obj_.tags.anchor_tag_html;
+      comp_obj_.tags.anchor_tags                = ["bibliography"];
+      the_document_bibliography_section         ~= comp_obj_;
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    }
+    {
+      string out_;
+      foreach (entry; biblio_ordered) {
+        out_ = format("%s \"%s\"%s%s%s%s%s%s%s%s%s.",
+          ((entry["author"].str.empty) ? entry["editor"].str : entry["author"].str),
+          entry["fulltitle"].str,
+          ((entry["journal"].str.empty) ? "" : ", " ~ mkup.ff_i ~ mkup.italic ~ mkup.ff_o ~ entry["journal"].str ~ mkup.ff_c ~ mkup.italic),
+          ((entry["volume"].str.empty) ? "" : ", " ~ entry["volume"].str),
+          ((entry["in"].str.empty) ? "" : ", " ~ entry["in"].str),
+          ((!(entry["author"].str.empty) && (!(entry["editor"].str.empty))) ? entry["editor"].str : ""),
+          ", " ~ entry["year"].str,
+          ((entry["pages"].str.empty) ? "" : ", " ~ entry["pages"].str),
+          ((entry["publisher"].str.empty) ? "" : ", " ~ entry["publisher"].str),
+          ((entry["place"].str.empty) ? "" : ", " ~ entry["place"].str),
+          ((entry["url"].str.empty) ? "" : ", [" ~ entry["url"].str ~ "]"),
+        );
+        comp_obj_                                   = set_object_generic("backmatter", "bibliography", "para", "bibliography", out_.to!string.strip, 0);
+        comp_obj_.metainfo.identifier               = "";
+        comp_obj_.metainfo.object_number_off        = true;
+        comp_obj_.metainfo.object_number_type       = 0;
+        comp_obj_.attrib.indent_hang                = 0;
+        comp_obj_.attrib.indent_base                = 1;
+        comp_obj_.attrib.bullet                     = bullet;
+        comp_obj_.tags.anchor_tags                  = [anchor_tag];
+        the_document_bibliography_section           ~= comp_obj_;
+      }
+    }
+  } else {
+    comp_obj_                                   = set_object_heading("lev1", "empty", "empty", "(skip) there is no Bibliography");
+    comp_obj_.metainfo.identifier               = "";
+    comp_obj_.metainfo.dummy_heading            = true;
+    comp_obj_.metainfo.object_number_off        = true;
+    comp_obj_.metainfo.object_number_type       = 0;
+    the_document_bibliography_section           ~= comp_obj_;
+  }
+  debug(bibliosection) { foreach (o; the_document_bibliography_section) { writeln(o.text); } }
+  ST_biblio_section ret;
+  {
+    ret.bibliography_section = the_document_bibliography_section;
+    ret.tag_assoc            = tag_assoc; //
+  }
+  return ret;
+}
+struct Bibliography {
+  @system ST_flow_bibliography flow_bibliography_()(
+    string[]    biblio_unsorted_incomplete,
+    JSONValue[] bib_arr_json
+  ) {
+    JSONValue[] biblio_unsorted
+      = biblio_make_unsorted_array_of_json_objects(biblio_unsorted_incomplete, bib_arr_json); // TODO lookat returns
+    biblio_arr_json = [];
+    biblio_unsorted_incomplete = [];
+    JSONValue[] biblio_sorted__ = biblio_sort(biblio_unsorted);
+    debug(biblio0) {
+      biblio_debug(biblio_sorted__);
+      writeln("---");
+      writeln("unsorted incomplete: ", biblio_unsorted_incomplete.length);
+      writeln("json:                ", bib_arr_json.length);
+      writeln("unsorted:            ", biblio_unsorted.length);
+      writeln("sorted:              ", biblio_sorted__.length);
+      int cntr;
+      int[7] x;
+      while (cntr < x.length) {
+        writeln(cntr, ": ", biblio_sorted__[cntr]["fulltitle"]);
+        cntr++;
+      }
+    }
+    ST_flow_bibliography ret;
+    {
+      ret.biblio_sorted  = biblio_sorted__;
+      ret.bib_arr_json  = bib_arr_json;
+      ret.biblio_unsorted_incomplete  = biblio_unsorted_incomplete;
+    }
+    return ret;
+  }
+  @system final private JSONValue[] biblio_make_unsorted_array_of_json_objects()(
+    string[]      biblio_unordered,
+    JSONValue[]   bib_arr_json
+  ) {
+    foreach (bibent; biblio_unordered) {
+      // update bib to include deemed_author, needed for:
+      // sort_bibliography_array_by_deemed_author_year_title
+      // either: sort on multiple fields, or; create such sort field
+      JSONValue j = parseJSON(bibent);
+      if (!empty(j["fulltitle"].str)) {
+        if (!empty(j["author_raw"].str)) {
+          j["deemed_author"] = j["author_arr"][0];
+        } else if (!empty(j["editor_raw"].str)) {
+          j["deemed_author"] = j["editor_arr"][0];
+        }
+        j["sortby_deemed_author_year_title"] = (
+          j["deemed_author"].str ~
+           "; " ~
+           j["year"].str ~
+           "; "  ~
+           j["fulltitle"].str
+        );
+      }
+      bib_arr_json ~= j;
+    }
+    return bib_arr_json.dup;
+  }
+  @system final private JSONValue[] biblio_sort()(JSONValue[] biblio_unordered) {
+    JSONValue[] biblio_sorted_;
+    biblio_sorted_
+      = sort!((a, b){
+        return ((a["sortby_deemed_author_year_title"].str) < (b["sortby_deemed_author_year_title"].str));
+      })(biblio_unordered).array;
+    debug(bibliosorted) {
+      foreach (j; biblio_sorted_) {
+        if (!empty(j["fulltitle"].str)) { writeln(j["sortby_deemed_author_year_title"]); }
+      }
+    }
+    return biblio_sorted_;
+  }
+  @system void biblio_debug()(JSONValue[] biblio_sorted) {
+    debug(biblio0) {
+      foreach (j; biblio_sorted) {
+        if (!empty(j["fulltitle"].str)) { writeln(j["sortby_deemed_author_year_title"]); }
+      }
+    }
+  }
+}
+// ↑ - section bibliography
+#+END_SRC
+
+***** ϝ section blurb
+
+#+NAME: ocdaFunc_section_blurb
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - section blurb
+ST_the_section build_the_blurb_section(Opt) (
+  char[]                 line,             // line is immutable, not necessary to return unchanged
+  uint[string]           pith,             // double check, should not be necessary to pass pith
+  string[string][string] tag_assoc,        // only for headings: html & epub
+  Opt                    opt_action,
+) {
+  static auto rgx = RgxI();
+  ObjGenericComposite comp_obj_;
+  ObjGenericComposite[] add_to_current_document_section;
+  // assert (opt_action.backmatter && opt_action.section_blurb);
+  indent = [
+    "hang_position" : 0,
+    "base_position" : 0,
+  ];
+  bullet = false;
+  if (auto m = line.matchFirst(rgx.para_indent)) {
+    debug(paraindent) { writeln(line); }
+    indent["hang_position"] = (m["indent"]).to!int;
+    indent["base_position"] = (m["indent"]).to!int;
+  } else if (line.matchFirst(rgx.para_bullet)) {
+    debug(parabullet) { writeln(line); }
+    bullet = true;
+  } else if (auto m = line.matchFirst(rgx.para_indent_hang)) {
+    debug(paraindenthang) { writeln(line); }
+    indent = [
+      "hang_position" : (m["hang"]).to!int,
+      "base_position" : (m["indent"]).to!int,
+    ];
+  } else if (auto m = line.matchFirst(rgx.para_bullet_indent)) {
+    debug(parabulletindent) { writeln(line); }
+    indent = [
+      "hang_position" : (m["indent"]).to!int,
+      "base_position" : (m["indent"]).to!int,
+    ];
+    bullet = true;
+  }
+  pith["txt_is"]           = eN.txt_is.para;
+  line_occur["para"]       = eN.bi.off;
+  an_object_key = "blurb_nugget";
+  ST_the_section ret;
+  if (line.matchFirst(rgx.heading_blurb)
+  && (opt_action.backmatter && opt_action.section_blurb)) {
+    {
+      comp_obj_                                              = set_object_heading("lev1", "backmatter", "blurb", "Blurb");
+      comp_obj_.metainfo.identifier                          = "";
+      comp_obj_.metainfo.dummy_heading                       = false;
+      comp_obj_.metainfo.object_number_off                   = false;
+      comp_obj_.metainfo.object_number_type                  = 0;
+      comp_obj_.tags.segment_anchor_tag_epub                 = "_part_blurb";
+      comp_obj_.tags.anchor_tag_html                         = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html                         = "blurb";
+      comp_obj_.tags.anchor_tags                             = ["section_blurb"];
+      comp_obj_.metainfo.dom_structure_markedup_tags_status  = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      comp_obj_.metainfo.dom_structure_collapsed_tags_status = [ 1, 1, 0, 0, 0, 0, 0, 0];
+      add_to_current_document_section                                 ~= comp_obj_;
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    }
+    {
+      comp_obj_                                              = set_object_heading("lev4", "backmatter", "blurb", "Blurb");
+      comp_obj_.metainfo.identifier                          = "";
+      comp_obj_.metainfo.dummy_heading                       = true;
+      comp_obj_.metainfo.object_number_off                   = true;
+      comp_obj_.metainfo.object_number_type                  = 0;
+      comp_obj_.tags.segment_anchor_tag_epub                 = "blurb";
+      comp_obj_.tags.anchor_tag_html                         = comp_obj_.tags.segment_anchor_tag_epub;
+      comp_obj_.tags.in_segment_html                         = comp_obj_.tags.anchor_tag_html;
+      comp_obj_.metainfo.heading_lev_collapsed               = 2;
+      comp_obj_.tags.anchor_tags                             = ["blurb"];
+      add_to_current_document_section                                 ~= comp_obj_;
+      tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+      tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    }
+  } else if (line.matchFirst(rgx.headings)
+  && (opt_action.backmatter && opt_action.section_blurb)) {
+    comp_obj_                                              = comp_obj_.init;
+    comp_obj_.metainfo.is_of_part                          = "backmatter";
+    comp_obj_.metainfo.is_of_section                       = "blurb";
+    comp_obj_.metainfo.is_of_type                          = "para";
+    comp_obj_.metainfo.is_a                                = "heading";
+    comp_obj_.text                                         = line.to!string;
+    comp_obj_.metainfo.ocn                                 = 0;
+    comp_obj_.metainfo.identifier                          = "";
+    comp_obj_.metainfo.dummy_heading                       = false;
+    comp_obj_.metainfo.object_number_off                   = true;
+    comp_obj_.metainfo.object_number_type                  = 0;
+    comp_obj_.tags.segment_anchor_tag_epub                 = "blurb";
+    comp_obj_.tags.anchor_tag_html                         = comp_obj_.tags.segment_anchor_tag_epub;
+    comp_obj_.tags.in_segment_html                         = comp_obj_.tags.anchor_tag_html;
+    comp_obj_.metainfo.heading_lev_markup                  = an_object["lev_markup_number"].to!int;    // make int, remove need to conv
+    comp_obj_.metainfo.heading_lev_collapsed               = an_object["lev_collapsed_number"].to!int; // make int, remove need to conv
+    comp_obj_.metainfo.parent_ocn                          = 1;
+    comp_obj_.metainfo.parent_lev_markup                   = 0;
+    add_to_current_document_section                                 ~= comp_obj_;
+    tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+    tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+  } else if (!(line.empty)) {
+    {
+      auto _get = line.flow_para_match_(an_object, an_object_key, indent, bullet, pith, line_occur);
+      {
+        an_object     = _get.this_object;
+        an_object_key = _get.this_object_key;
+        pith          = _get.pith;
+        indent        = _get.indent;
+        bullet        = _get.bullet;
+        line_occur    = _get.line_occur;
+      }
+    }
+    comp_obj_                               = set_object_generic("backmatter", "blurb", "para", "blurb", links_and_images(line.to!string.strip).replaceFirst(rgx.para_attribs, ""), 0);
+    comp_obj_.metainfo.identifier           = "";
+    comp_obj_.metainfo.object_number_off    = true;
+    comp_obj_.metainfo.object_number_type   = 0;
+    comp_obj_.attrib.indent_hang            = indent["hang_position"];
+    comp_obj_.attrib.indent_base            = indent["base_position"];
+    comp_obj_.has.inline_links              = true;
+    comp_obj_.attrib.bullet                 = bullet;
+    add_to_current_document_section         ~= comp_obj_;
+  }
+  pith["ocn"] = eN.ocn.on;
+  {
+    ret.comp_section_obj = add_to_current_document_section;
+    ret.pith             = pith;
+    ret.tag_assoc        = tag_assoc; // NO CHANGE here, only for headings: html & epub
+  }
+  return ret;
+}
+// ↑ - section blurb
+#+END_SRC
+
+**** ϝ structure (segments, ancestors, descendants)
+***** ϝ segnames
+
+#+NAME: ocdaFunc_segnames
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - segnames
+@system ST_segnames after_doc_determine_segnames(
+  ObjGenericComposite[] the_document_body_section,
+  ObjGenericComposite[] the_document_endnotes_section,
+  ObjGenericComposite[] the_document_glossary_section,
+  ObjGenericComposite[] the_document_bibliography_section,
+  ObjGenericComposite[] the_document_bookindex_section,
+  ObjGenericComposite[] the_document_blurb_section,
+  string[][string]      segnames,
+  int                   html_segnames_ptr_cntr,
+  int                   html_segnames_ptr,
+) {
+  if (the_document_endnotes_section.length > 1) {
+    segnames["html"] ~= "endnotes";
+    segnames["epub"] ~= "endnotes";
+    html_segnames_ptr = html_segnames_ptr_cntr;
+    foreach (ref obj; the_document_endnotes_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        obj.ptr.html_segnames = html_segnames_ptr;
+        break;
+      }
+    }
+    html_segnames_ptr_cntr++;
+  }
+  if (the_document_glossary_section.length > 1) {
+    segnames["html"] ~= "glossary";
+    segnames["epub"] ~= "glossary";
+    html_segnames_ptr = html_segnames_ptr_cntr;
+    foreach (ref obj; the_document_glossary_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        obj.ptr.html_segnames = html_segnames_ptr;
+        break;
+      }
+    }
+    html_segnames_ptr_cntr++;
+  }
+  if (the_document_bibliography_section.length > 1) {
+    segnames["html"] ~= "bibliography";
+    segnames["epub"] ~= "bibliography";
+    html_segnames_ptr = html_segnames_ptr_cntr;
+    foreach (ref obj; the_document_bibliography_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        obj.ptr.html_segnames = html_segnames_ptr;
+        break;
+      }
+    }
+    html_segnames_ptr_cntr++;
+  }
+  if (the_document_bookindex_section.length > 1) {
+    segnames["html"] ~= "bookindex";
+    segnames["epub"] ~= "bookindex";
+    html_segnames_ptr = html_segnames_ptr_cntr;
+    foreach (ref obj; the_document_bookindex_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        obj.ptr.html_segnames = html_segnames_ptr;
+        break;
+      }
+    }
+    html_segnames_ptr_cntr++;
+  }
+  if (the_document_blurb_section.length > 1) {
+    segnames["html"] ~= "blurb";
+    segnames["epub"] ~= "blurb";
+    html_segnames_ptr = html_segnames_ptr_cntr;
+    foreach (ref obj; the_document_blurb_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        obj.ptr.html_segnames = html_segnames_ptr;
+        break;
+      }
+    }
+    html_segnames_ptr_cntr++;
+  }
+  ST_segnames ret;
+  ret.segnames                          = segnames;
+  ret.html_segnames_ptr_cntr            = html_segnames_ptr_cntr;
+  ret.html_segnames_ptr                 = html_segnames_ptr;
+  return ret;
+}
+// ↑ - segnames
+#+END_SRC
+
+***** ϝ structure ancestors
+
+#+NAME: ocdaFunc_structure_ancestors
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - ancestors descendants
+struct NodeStructureMetadata {
+  int lv, lv0, lv1, lv2, lv3, lv4, lv5, lv6, lv7;
+  int obj_cite_digit;
+  int[string] p_; // p_ parent_
+  static auto rgx = RgxI();
+  @safe ObjGenericComposite node_location_emitter(La,Ta)(
+    string         lev_markup_number,
+    string[string] tag_in_seg,
+    La             lev_anchor_tag,
+    Ta             tag_assoc,
+    OCNset         obj_cite_digits,
+    int            cntr_,
+    int            ptr_,
+    string         is_
+  ) {
+    debug(asserts) { static assert(is(typeof(obj_cite_digits.object_number) == int)); }
+    assert(is_ != "heading");
+    assert(obj_cite_digits.object_number.to!int >= 0);
+    assert(is_ != "heading");                          // should not be necessary
+    assert(obj_cite_digits.object_number.to!int >= 0); // should not be necessary
+    if (lv7 > eN.bi.off) {
+      p_["lev_markup_number"]                       = DocStructMarkupHeading.h_text_4;
+      p_["object_number"]                           = lv7;
+    } else if (lv6 > eN.bi.off) {
+      p_["lev_markup_number"]                       = DocStructMarkupHeading.h_text_3;
+      p_["object_number"]                           = lv6;
+    } else if (lv5 > eN.bi.off) {
+      p_["lev_markup_number"]                       = DocStructMarkupHeading.h_text_2;
+      p_["object_number"]                           = lv5;
+    } else {
+      p_["lev_markup_number"]                       = DocStructMarkupHeading.h_text_1;
+      p_["object_number"]                           = lv4;
+    }
+    ObjGenericComposite comp_obj_location;
+    comp_obj_location                               = comp_obj_location.init;
+    comp_obj_location.metainfo.is_a                 = is_;
+    comp_obj_location.metainfo.ocn                  = obj_cite_digits.object_number;
+    comp_obj_location.metainfo.identifier           = obj_cite_digits.identifier;
+    comp_obj_location.tags.anchor_tag_html          = tag_in_seg["seg_lv4"];
+    comp_obj_location.tags.segment_anchor_tag_epub  = tag_in_seg["seg_lv1to4"];
+    comp_obj_location.tags.heading_lev_anchor_tag   = lev_anchor_tag;
+    comp_obj_location.metainfo.parent_ocn           = p_["object_number"];
+    comp_obj_location.metainfo.parent_lev_markup    = p_["lev_markup_number"];
+    debug(_node) {
+      if (lev_markup_number.match(rgx.levels_numbered_headings)) { writeln("x ", _node.to!string);
+      } else { writeln("- ", _node.to!string); }
+    }
+    assert(comp_obj_location.metainfo.parent_lev_markup >= 4);
+    assert(comp_obj_location.metainfo.parent_lev_markup <= 7);
+    assert(comp_obj_location.metainfo.parent_ocn >= 0);
+    return comp_obj_location;
+  }
+  invariant() {
+  }
+  @safe ObjGenericComposite node_emitter_heading(O,TaL,TA,SOAT)(
+    O              an_object,
+    string[string] tag_in_seg,
+    TaL            lev_anchor_tag,
+    TA             tag_assoc,
+    OCNset         obj_cite_digits,
+    int            cntr_,
+    int            ptr_,
+    string[]       lv_ancestors_txt,
+    int            html_segnames_ptr,
+    SOAT           substantive_object_and_anchor_tags_struct,
+  ) {
+    string _text                = an_object["substantive"];
+    string lev_markup_number    = an_object["lev_markup_number"];
+    string lev_collapsed_number = an_object["lev_collapsed_number"];
+    string dummy_heading_status = an_object["dummy_heading_status"];
+    string is_                  = an_object["is"];
+    debug(asserts) {
+      static assert(is(typeof(lev)                                       == string));
+      static assert(is(typeof(obj_cite_digits.object_number)             == int));
+    }
+    assert(is_ == "heading");
+    assert((obj_cite_digits.object_number).to!int >= 0);
+    assert(
+      lev_markup_number.match(rgx.levels_numbered),
+      ("not a valid heading level: " ~ lev_markup_number ~ " at " ~ obj_cite_digits.object_number.to!string)
+    );
+    if (lev_markup_number.match(rgx.levels_numbered)) {
+      if (lev_markup_number.to!int == 0) {
+        // TODO first hit (of two) with this assertion failure, check, fix & reinstate
+        // assert(obj_cite_digits.object_number.to!int == 1,
+        //   "ERROR header lev markup number is: " ~
+        //   lev_markup_number.to!string ~
+        //   " obj_cite_digits.object_number.to!int should == 1 but is: " ~
+        //    obj_cite_digits.object_number.to!string ~
+        //   "\n" ~ _text);
+      }
+    }
+    switch (lev_markup_number.to!int) {
+    case 0:
+      lv = DocStructMarkupHeading.h_sect_A;
+      lv0 = obj_cite_digit;
+      lv1 = 0; lv2 = 0; lv3 = 0; lv4 = 0; lv5 = 0; lv6 = 0; lv7 = 0;
+      p_["lev_markup_number"] = 0;
+      p_["object_number"] = 0;
+      break;
+    case 1:
+      lv = DocStructMarkupHeading.h_sect_B;
+      lv1 = obj_cite_digit;
+      lv2 = 0; lv3 = 0; lv4 = 0; lv5 = 0; lv6 = 0; lv7 = 0;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_sect_A;
+      p_["object_number"] = lv0;
+      break;
+    case 2:
+      lv = DocStructMarkupHeading.h_sect_C;
+      lv2 = obj_cite_digit;
+      lv3 = 0; lv4 = 0; lv5 = 0; lv6 = 0; lv7 = 0;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_sect_B;
+      p_["object_number"] = lv1;
+      break;
+    case 3:
+      lv = DocStructMarkupHeading.h_sect_D;
+      lv3 = obj_cite_digit;
+      lv4 = 0; lv5 = 0; lv6 = 0; lv7 = 0;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_sect_C;
+      p_["object_number"] = lv2;
+      break;
+    case 4:
+      lv = DocStructMarkupHeading.h_text_1;
+      lv4 = obj_cite_digit;
+      lv5 = 0; lv6 = 0; lv7 = 0;
+      if (lv3 > eN.bi.off) {
+        p_["lev_markup_number"]
+          = DocStructMarkupHeading.h_sect_D;
+        p_["object_number"] = lv3;
+      } else if (lv2 > eN.bi.off) {
+        p_["lev_markup_number"]
+          = DocStructMarkupHeading.h_sect_C;
+        p_["object_number"] = lv2;
+      } else if (lv1 > eN.bi.off) {
+        p_["lev_markup_number"]
+          = DocStructMarkupHeading.h_sect_B;
+        p_["object_number"] = lv1;
+      } else {
+        p_["lev_markup_number"]
+          = DocStructMarkupHeading.h_sect_A;
+        p_["object_number"] = lv0;
+      }
+      break;
+    case 5:
+      lv = DocStructMarkupHeading.h_text_2;
+      lv5 = obj_cite_digit;
+      lv6 = 0; lv7 = 0;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_text_1;
+      p_["object_number"] = lv4;
+      break;
+    case 6:
+      lv = DocStructMarkupHeading.h_text_3;
+      lv6 = obj_cite_digit;
+      lv7 = 0;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_text_2;
+      p_["object_number"] = lv5;
+      break;
+    case 7:
+      lv = DocStructMarkupHeading.h_text_4;
+      lv7 = obj_cite_digit;
+      p_["lev_markup_number"]
+        = DocStructMarkupHeading.h_text_3;
+      p_["object_number"] = lv6;
+      break;
+    default:
+      break;
+    }
+    ObjGenericComposite comp_obj_;
+    comp_obj_                                        = comp_obj_.init;
+    comp_obj_.metainfo.is_of_part                    = "body";
+    comp_obj_.metainfo.is_of_section                 = "body";
+    comp_obj_.metainfo.is_of_type                    = "para";
+    comp_obj_.metainfo.is_a                          = "heading";
+    comp_obj_.text                                   = _text.to!string.strip;
+    comp_obj_.metainfo.ocn                           = obj_cite_digits.object_number;
+    comp_obj_.metainfo.identifier                    = obj_cite_digits.identifier;
+    comp_obj_.metainfo.dummy_heading                 = (dummy_heading_status == "t") ? true: false;
+    comp_obj_.metainfo.object_number_off             = obj_cite_digits.off;
+    // comp_obj_.metainfo.o_n_book_index             = obj_cite_digits.bkidx;
+    comp_obj_.metainfo.object_number_type            = obj_cite_digits.type;
+    comp_obj_.tags.segment_anchor_tag_epub           = tag_in_seg["seg_lv1to4"];
+    comp_obj_.tags.anchor_tag_html                   = tag_in_seg["seg_lv4"];
+    comp_obj_.tags.in_segment_html                   = comp_obj_.tags.anchor_tag_html;
+    comp_obj_.tags.heading_lev_anchor_tag            = lev_anchor_tag;
+    comp_obj_.tags.html_segment_anchor_tag_is        = tag_in_seg["seg_lv4"];
+    comp_obj_.tags.epub_segment_anchor_tag_is        = tag_in_seg["seg_lv1to4"];
+    comp_obj_.metainfo.heading_lev_markup            = (!(lev_markup_number.empty) ? lev_markup_number.to!int : 0);
+    comp_obj_.metainfo.heading_lev_collapsed         = (!(lev_collapsed_number.empty) ? lev_collapsed_number.to!int : 0);
+    comp_obj_.metainfo.parent_ocn                    = p_["object_number"];
+    comp_obj_.metainfo.parent_lev_markup             = p_["lev_markup_number"];
+    comp_obj_.tags.heading_ancestors_text            = lv_ancestors_txt;
+    comp_obj_.ptr.doc_object                         = cntr_;
+    comp_obj_.ptr.html_segnames                      = ((lev_markup_number == "4") ? html_segnames_ptr : 0);
+    comp_obj_.ptr.heading                            = ptr_;
+    comp_obj_.has.inline_notes_reg                   = substantive_object_and_anchor_tags_struct.has_notes_reg;
+    comp_obj_.has.inline_notes_star                  = substantive_object_and_anchor_tags_struct.has_notes_star;
+    comp_obj_.has.inline_links                       = substantive_object_and_anchor_tags_struct.has_links;
+    tag_assoc[comp_obj_.tags.anchor_tag_html]["seg_lv4"]            = comp_obj_.tags.in_segment_html;
+    tag_assoc[comp_obj_.tags.segment_anchor_tag_epub]["seg_lv1to4"] = comp_obj_.tags.segment_anchor_tag_epub;
+    debug(_node) {
+      if (lev_markup_number.match(rgx.levels_numbered_headings)) { writeln("* ", _node.to!string); }
+    }
+    debug(nodeheading) {
+      if (lev_markup_number.match(rgx.levels_numbered_headings)) { writeln("* ", _node.to!string); }
+    }
+    assert(comp_obj_.metainfo.parent_lev_markup <= 7);
+    assert(comp_obj_.metainfo.parent_ocn >= 0);
+    if (lev_markup_number.match(rgx.levels_numbered_headings)) {
+      assert(comp_obj_.metainfo.heading_lev_markup <= 7);
+      assert(comp_obj_.metainfo.ocn >= 0);
+      if (comp_obj_.metainfo.parent_lev_markup > 0) {
+        assert(comp_obj_.metainfo.parent_lev_markup < comp_obj_.metainfo.heading_lev_markup);
+        if (comp_obj_.metainfo.ocn != 0) {
+          assert(comp_obj_.metainfo.parent_ocn < comp_obj_.metainfo.ocn);
+        }
+      }
+      if (comp_obj_.metainfo.heading_lev_markup == 0) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_A);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_B) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_A);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_C) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_B);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_sect_D) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_sect_C);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_1) {
+        assert(comp_obj_.metainfo.parent_lev_markup <= DocStructMarkupHeading.h_sect_D);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_2) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_1);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_3) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_2);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_4) {
+        assert(comp_obj_.metainfo.parent_lev_markup == DocStructMarkupHeading.h_text_3);
+      } else if  (comp_obj_.metainfo.heading_lev_markup == DocStructMarkupHeading.h_text_5) {
+      }
+    }
+    return comp_obj_;
+  }
+  invariant() {
+  }
+}
+@system ST_ancestors after_doc_determine_ancestors(
+  ObjGenericComposite[] the_document_body_section,
+  ObjGenericComposite[] the_document_endnotes_section,
+  ObjGenericComposite[] the_document_glossary_section,
+  ObjGenericComposite[] the_document_bibliography_section,
+  ObjGenericComposite[] the_document_bookindex_section,
+  ObjGenericComposite[] the_document_blurb_section,
+) {
+  @safe int[] _get_ancestors_markup(ObjGenericComposite obj, int[] _ancestors_markup) {
+    if (obj.metainfo.is_a == "heading") {
+      debug(dom) { writeln(obj.text); }
+      if (obj.metainfo.heading_lev_markup == 1) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          0,0,0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 2) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          0,0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 3) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 4) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          _ancestors_markup[3],
+          0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 5) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          _ancestors_markup[3],
+          _ancestors_markup[4],
+          0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 6) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          _ancestors_markup[3],
+          _ancestors_markup[4],
+          _ancestors_markup[5],
+          0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 7) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          _ancestors_markup[3],
+          _ancestors_markup[4],
+          _ancestors_markup[5],
+          _ancestors_markup[6],
+          0
+        ];
+      }
+      if (obj.metainfo.heading_lev_markup == 8) {
+        _ancestors_markup = [
+          _ancestors_markup[0],
+          _ancestors_markup[1],
+          _ancestors_markup[2],
+          _ancestors_markup[3],
+          _ancestors_markup[4],
+          _ancestors_markup[5],
+          _ancestors_markup[6],
+          _ancestors_markup[7]
+        ];
+      }
+      _ancestors_markup[obj.metainfo.heading_lev_markup] = obj.metainfo.ocn;
+    }
+    debug(ancestor_markup) { writeln("marked up: ", _ancestors_markup); }
+    return _ancestors_markup;
+  }
+  @safe int[] _get_ancestors_collapsed(ObjGenericComposite obj, int[] _ancestors_collapsed) {
+    if (obj.metainfo.is_a == "heading") {
+      if (obj.metainfo.heading_lev_collapsed == 1) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          0,0,0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 2) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          0,0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 3) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          0,0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 4) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          _ancestors_collapsed[3],
+          0,0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 5) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          _ancestors_collapsed[3],
+          _ancestors_collapsed[4],
+          0,0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 6) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          _ancestors_collapsed[3],
+          _ancestors_collapsed[4],
+          _ancestors_collapsed[5],
+          0,0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 7) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          _ancestors_collapsed[3],
+          _ancestors_collapsed[4],
+          _ancestors_collapsed[5],
+          _ancestors_collapsed[6],
+          0
+        ];
+      }
+      if (obj.metainfo.heading_lev_collapsed == 8) {
+        _ancestors_collapsed = [
+          _ancestors_collapsed[0],
+          _ancestors_collapsed[1],
+          _ancestors_collapsed[2],
+          _ancestors_collapsed[3],
+          _ancestors_collapsed[4],
+          _ancestors_collapsed[5],
+          _ancestors_collapsed[6],
+          _ancestors_collapsed[7]
+        ];
+      }
+      _ancestors_collapsed[obj.metainfo.heading_lev_collapsed] = obj.metainfo.ocn;
+    }
+    debug(ancestor_collapsed) { writeln("collapsed: ", _ancestors_collapsed); }
+    return _ancestors_collapsed;
+  }
+  // multiple 1~ levels, loop through document body
+  if (the_document_body_section.length > 1) {
+    int[] _ancestors_markup = [0,0,0,0,0,0,0,0];
+    int[][] _ancestors_markup_;
+    _ancestors_markup = [1,0,0,0,0,0,0,0];
+    _ancestors_markup_ ~= _ancestors_markup;
+    int[] _ancestors_collapsed = [0,0,0,0,0,0,0,0];
+    int[][] _ancestors_collapsed_;
+    _ancestors_collapsed = [1,0,0,0,0,0,0,0];
+    _ancestors_collapsed_ ~= _ancestors_collapsed;
+    foreach (ref obj; the_document_body_section) {
+      if (obj.metainfo.is_a == "heading") {
+        obj.metainfo.markedup_ancestors = _get_ancestors_markup(obj, _ancestors_markup);
+        obj.metainfo.collapsed_ancestors = _get_ancestors_collapsed(obj, _ancestors_collapsed);
+        obj.metainfo.parent_ocn = obj.metainfo.markedup_ancestors[obj.metainfo.parent_lev_markup];
+      }
+    }
+    debug(ancestors) {
+      writeln("ancestors markup o_n:    ", obj.metainfo.markedup_ancestors);
+      writeln("ancestors collapsed o_n: ", obj.metainfo.markedup_ancestors);
+    }
+  }
+  ST_ancestors ret;
+  ret.the_document_body_section         = the_document_body_section;
+  ret.the_document_endnotes_section     = the_document_endnotes_section;
+  ret.the_document_glossary_section     = the_document_glossary_section;
+  ret.the_document_bibliography_section = the_document_bibliography_section;
+  ret.the_document_bookindex_section    = the_document_bookindex_section;
+  ret.the_document_blurb_section        = the_document_blurb_section;
+  return ret;
+}
+// ↑ - ancestors
+#+END_SRC
+
+***** ϝ structure descendants
+
+#+NAME: ocdaFunc_structure_descendants
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - descendants
+// descendants
+@safe auto after_doc_get_descendants()(ObjGenericComposite[] document_sections) {
+  int[string] _heading_ocn_descendants;
+  string[] _ocn_open_key = ["","","","","","","",""];
+  auto _doc_sect_length = document_sections.length - 1;
+  int _last_ocn;
+  foreach (_lg, ref obj; document_sections) {
+    if (obj.metainfo.is_a == "heading") {
+      foreach (_dts_lv, dom_tag_status; obj.metainfo.dom_structure_markedup_tags_status) {
+        switch (dom_tag_status) with (DomTags) {
+        case none: break;
+        case open:
+            _ocn_open_key[_dts_lv] = (obj.metainfo.ocn).to!string;
+            _heading_ocn_descendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn;
+          break;
+        case close:
+          if (_ocn_open_key[_dts_lv].empty) {
+            _ocn_open_key[_dts_lv] = "0";
+          }
+          _heading_ocn_descendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn - 1;
+          _ocn_open_key[_dts_lv] = (0).to!string;
+          break;
+        case close_and_open:
+          if (_ocn_open_key[_dts_lv].empty) {
+            _ocn_open_key[_dts_lv] = "0";
+          }
+          _heading_ocn_descendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn - 1;
+          _ocn_open_key[_dts_lv] = (obj.metainfo.ocn).to!string;
+          _heading_ocn_descendants[_ocn_open_key[_dts_lv]] = obj.metainfo.ocn;
+          break;
+        case open_still: break;
+        default: break;
+        }
+      }
+    }
+    if (obj.metainfo.ocn > 0) {
+      _last_ocn = obj.metainfo.ocn;
+    }
+    if (_lg == _doc_sect_length) {
+      _heading_ocn_descendants["1"] = _last_ocn; // close existing o_n key
+    }
+  }
+  Tuple!(int, int)[] pairs;
+  foreach (pair; _heading_ocn_descendants.byPair) {
+    pairs ~= tuple(pair[0].to!int, pair[1]);
+  }
+  return pairs.sort;
+}
+// ↑ - descendants
+#+END_SRC
+
+**** ϝ assertions
+
+#+NAME: ocdaFunc_assertions
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+// ↓ - assertions
+@safe pure void assertions_doc_structure()(
+  string[string]  an_object,
+  string          an_object_key,
+  int[string]     lv
+) {
+  string msg_error_doc_struct = "\nERROR in document structure, check markup (heading level relationships):\n";
+  if (lv["h3"] > eN.bi.off) {
+    assert(lv["h0"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h1"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h2"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h2"] > eN.bi.off) {
+    assert(lv["h0"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h1"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h1"] > eN.bi.off) {
+    assert(lv["h0"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h2"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h0"] > eN.bi.off) {
+    assert(lv["h1"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h2"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else {
+    assert(lv["h0"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h1"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h2"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h7"] > eN.bi.off) {
+    assert(lv["h4"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ "missing segment level 1~\n"
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h5"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h6"] > eN.bi.off) {
+    assert(lv["h4"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ "missing segment level 1~\n"
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h5"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h5"] > eN.bi.off) {
+    assert(lv["h4"] > eN.bi.off,
+      msg_error_doc_struct
+      ~ "missing segment level 1~\n"
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else if (lv["h4"] > eN.bi.off) {
+    assert(lv["h5"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  } else {
+    assert(lv["h4"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ "missing segment level 1~\n"
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h5"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h0"] == eN.bi.off) {
+    assert(lv["h1"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h2"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h4"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ "missing segment level 1~\n"
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h5"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h1"] == eN.bi.off) {
+    assert(lv["h2"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h2"] == eN.bi.off) {
+    assert(lv["h3"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h3"] == eN.bi.off) {
+  }
+  if (lv["h4"] == eN.bi.off) {
+    assert(lv["h5"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h5"] == eN.bi.off) {
+    assert(lv["h6"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h6"] == eN.bi.off) {
+    assert(lv["h7"] == eN.bi.off,
+      msg_error_doc_struct
+      ~ an_object[an_object_key]
+    );
+  }
+  if (lv["h7"] == eN.bi.off) {
+  }
+  switch ((an_object["lev"]).to!string) {
+  case "A":
+    if (lv["h0"] == eN.bi.off) {
+      assert(lv["h1"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h2"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h3"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~\n"
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h7"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                       // (lv["h0"] > eN.bi.off)
+      assert(lv["h0"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "should not enter level A a second time\n"
+        ~ "at level A~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "B":
+    if (lv["h1"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level B~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h2"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level B~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h3"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level B~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                       // (lv["h1"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level B~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h1"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level B~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "C":
+    if (lv["h2"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h1"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "level C should not follow level A\n"
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h3"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                       // (lv["h2"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h1"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h2"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level C~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "D":
+    if (lv["h3"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h1"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "level D should not follow level A\n"
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h2"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                      // (lv["h3"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h1"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h2"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h3"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level D~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "1":
+    if (lv["h4"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h7"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                      // (lv["h4"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 1~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "2":
+    if (lv["h5"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h7"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                      // (lv["h5"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 2~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "3":
+    if (lv["h6"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 2~ ?\n"
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h7"] == eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                      // (lv["h6"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 3~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  case "4":
+    if (lv["h7"] == eN.bi.off) {
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 2~ ?\n"
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 3~ ?\n"
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+    } else {                      // (lv["h7"] > eN.bi.off)
+      assert(lv["h0"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h4"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "missing segment level 1~ ?\n"
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h5"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h6"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+      assert(lv["h7"] > eN.bi.off,
+        msg_error_doc_struct
+        ~ "at level 4~\n"
+        ~ an_object[an_object_key]
+      );
+    }
+    break;
+  default:
+    break;
+  }
+}
+// ↑ - assertions
+#+END_SRC
+
+** template docSectKeysSeq
+
+#+NAME: docSectKeysSeq
+#+HEADER: :noweb yes
+#+BEGIN_SRC d
+@safe auto docSectKeysSeq(string[][string] document_section_keys_sequenced) {
+  struct doc_sect_keys_seq {
+    string[] scroll() {
+      return document_section_keys_sequenced["scroll"];
+    }
+    string[] seg() {
+      return document_section_keys_sequenced["seg"];
+    }
+    string[] sql() {
+      return document_section_keys_sequenced["sql"];
+    }
+    string[] latex() {
+      return document_section_keys_sequenced["latex"];
+    }
+  }
+  return doc_sect_keys_seq();
+}
+#+END_SRC
+
+* document header including copyright & license
+
+#+NAME: doc_header_including_copyright_and_license
+#+HEADER: :noweb yes
+#+BEGIN_SRC emacs-lisp
+<<./spine_version_info_and_doc_header_including_copyright_and_license.org:spine_doc_header_including_copyright_and_license()>>
+#+END_SRC
+
+* __END__