/+
  extract sdl header return sdl
+/
template SiSUheaderExtractSDLang() {
  private import
    std.regex;
  private import
    ao_rgx;
  struct HeaderExtractSDL {
    mixin SiSUregisters;
    mixin RgxInit;
    auto rgx = Rgx();
    private auto documentMakeSDLangToJSONmake(Tag document_make_sdlang) {
      /+ dochead +/
      string hm;
      string hs;
      /+ make +/
      auto dochead_make = parseJSON(make_jsonstr).object;
      if (!(document_make_sdlang.maybe.tags["make"].empty)) {
        hm = "make";
        hs = "bold";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "breaks";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "cover_image";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "css";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "emphasis";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "footer";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "headings";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "home_button_image";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "home_button_text";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "italics";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "num_top";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "substitute";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "texpdf_font";
        if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      /+
      hm = "links";
      if (!(document_make_sdlang.maybe.tags[hm].empty)) {
        /+ TODO
          stuff to fix
        +/
        // hs = "link";
        // if (!(document_make_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        // && (document_make_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
        //   writeln(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        //   dochead_meta[hm][hs].str =
        //     to!string(document_make_sdlang.tags[hm][0].attributes[hs][0].value);
        // }
      }
      +/
      // writeln(dochead_make);
      return dochead_make;
    }
    final private auto headerMakeSDLang(in string src_header) {
      scope(failure) {
        stderr.writefln(
          "%s\n%s\n%s:%s failed here:\n  src_header: %s",
          __MODULE__, __FUNCTION__,
          __FILE__, __LINE__,
          src_header,
        );
      }
      Tag sdl_root_header;
      try {
        sdl_root_header = parseSource(src_header);
      }
      catch(SDLangParseException e) {
        stderr.writeln("SDLang problem with this document header:");
        stderr.writeln(src_header);
        // Error messages of the form:
        // myFile.sdl(5:28): Error: Invalid integer suffix.
        stderr.writeln(e.msg);
      }
      debug(sdlang) {
        writeln("header SDL:");
        writeln(sdl_root_header.toSDLDocument());
      }
      return sdl_root_header;
    }
    private auto headerSDLangGet(in char[] src_header) {
      char[][] source_header_arr =
        split(cast(char[]) src_header, rgx.line_delimiter);
      char[] header_clean;
      // TODO
      foreach(header_line; source_header_arr) {
        if (!match(header_line, rgx.comments)) {
          header_clean ~= header_line ~ "\n";
          // writeln(header_line);
        }
      }
      /+ get sdlang tags +/
      auto header_sdlang=headerMakeSDLang(to!string(header_clean));
      debug(sdlang) {
        writeln("--------------");
        stdout.rawWrite( header_sdlang.toSDLDocument() );
        writeln("--------------");
        Value test = header_sdlang.tags["title"][0].values[0];
        assert(test == typeid(string));
        writeln(header_sdlang.maybe.tags["title"]);
        writeln(header_sdlang.maybe.tags["title"][0].maybe.attributes["subtitle"]);
      }
      return header_sdlang; // sdlang.ast.Tag
    }
    private auto headerSDLangToJSONmake(Tag header_sdlang, JSONValue[string] dochead_make) {
      /+ TODO json next +/
      /+ TODO
        auto dochead_make = parseJSON(make_jsonstr).object;
        auto dochead_meta = parseJSON(meta_jsonstr).object;
        auto hm = to!string(t.captures[1]);
        auto hs = to!string(s.captures[1]);
        if (dochead_make[hm][hs].type() == JSON_TYPE.STRING) {
          dochead_make[hm][hs].str = to!string(s.captures[2]);
        }
        if (dochead_meta[hm][hs].type() == JSON_TYPE.STRING) {
          dochead_meta[hm][hs].str = to!string(s.captures[2]);
        }
      +/
      /+ dochead +/
      string hm;
      string hs;
      /+ make +/
      if (!(header_sdlang.maybe.tags["make"].empty)) {
        hm = "make";
        hs = "bold";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "breaks";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "cover_image";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "css";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "emphasis";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "footer";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "headings";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "home_button_image";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "home_button_text";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "italics";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "num_top";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "substitute";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "texpdf_font";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_make[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      /+ meta +/
      auto dochead_meta = parseJSON(meta_jsonstr).object;
      hm = "title";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        /+ TODO Title REQUIRED +/
        hs = "main";
        if (!(header_sdlang.tags[hm].empty)
        && (header_sdlang.tags[hm][0].values[0].length > 1)) {
          writeln(header_sdlang.tags[hm][0].values[0]);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].values[0]);
            // to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        } else if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        } else {
          writeln("Required header metadata Title, missing");
        }
        hs = "sub";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        } else if (!(header_sdlang.tags[hm][0].maybe.attributes["subtitle"].empty)
        && (header_sdlang.tags[hm][0].attributes["subtitle"][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes["subtitle"][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes["subtitle"][0].value);
        }
        // full title composite (main + sub)
        // hs = "full";
        // dochead_meta[hm][hs] = dochead_meta[hm]["main"] ~ dochead_meta[hm]["sub"];
        hs = "language";
        if (!(header_sdlang.tags[hm][0].maybe.attributes["lang"].empty)
        && (header_sdlang.tags[hm][0].attributes["lang"][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes["lang"][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes["lang"][0].value);
        } else if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "edition";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "note";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "creator";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        /+ Creator / Author REQUIRED +/
        /+ TODO
        - decide on representation for & deal with multiple authors;
        - author(s) full name;
        - author(s) surname & other parts
        +/
        hs = "author";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "author_email";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "illustrator";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "translator";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "classify";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "dewey";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "keywords";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "loc";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "subject";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "topic_register";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "date";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "added_to_site";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "available";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "created";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "issued";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "modified";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "published";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "valid";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "identifier";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "isbn";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "oclc";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "pg";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "links";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        /+ TODO
          stuff to fix
        +/
        // hs = "link";
        // if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        // && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
        //   writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
        //   dochead_meta[hm][hs].str =
        //     to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        // }
      }
      hm = "notes";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "abstract";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "description";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "original";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "language";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "source";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "title";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "publisher";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "name";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      hm = "rights";
      if (!(header_sdlang.maybe.tags[hm].empty)) {
        hs = "copyright";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "cover";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "illustrations";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
        hs = "license";
        if (!(header_sdlang.tags[hm][0].maybe.attributes[hs].empty)
        && (header_sdlang.tags[hm][0].attributes[hs][0].value.length > 1)) {
          writeln(header_sdlang.tags[hm][0].attributes[hs][0].value);
          dochead_meta[hm][hs].str =
            to!string(header_sdlang.tags[hm][0].attributes[hs][0].value);
        }
      }
      // writeln(dochead_make);
      // writeln(dochead_meta);
      auto t = tuple(dochead_make, dochead_meta);
      static assert(!isTypeTuple!(t));
      return t;
    }
    private auto headerSDLangToJSON(char[] header_sdlang_src, JSONValue[string] conf_doc_make_json) {
      auto header_sdlang_tag = headerSDLangGet(header_sdlang_src); // sdlang.ast.Tag
      auto header_json_tuple = headerSDLangToJSONmake(header_sdlang_tag, conf_doc_make_json);
      return header_json_tuple;
    }
    
  }
}