1 files changed, 10 insertions, 7 deletions
diff --git a/src/sdp/output/epub3.d b/src/sdp/output/epub3.d
index b05cf20..2c014b5 100644
--- a/src/sdp/output/epub3.d
+++ b/src/sdp/output/epub3.d
@@ -287,6 +287,7 @@ template outputEPub3() {
       foreach (obj; doc_abstraction[part]) {
         string _txt = xhtml_format.special_characters(obj, obj.text);
         if (obj.is_a == "heading") {
+          assert(part == "head" || "toc_seg" || "body" || "endnotes" || "glossary" || "bibliography" || "bookindex_seg" || "blurb" || "tail");
           switch (obj.heading_lev_markup) {
           case 0: .. case 3:
             /+ fill buffer, and replace with new levels from 1 to 3 +/
@@ -343,8 +344,9 @@ template outputEPub3() {
             break;
           }
         } else {
+          assert(part == "head" || "toc_seg" || "body" || "endnotes" || "glossary" || "bibliography" || "bookindex_seg" || "blurb" || "tail");
           switch (obj.use) {
-          case "frontmatter":
+          case "frontmatter":             assert(part == "head" || "toc_seg");
             switch (obj.is_of) {
             case "para":
               switch (obj.is_a) {
@@ -367,7 +369,7 @@ template outputEPub3() {
               break;
             }
             break;
-          case "body":
+          case "body":                    assert(part == "body");
             switch (obj.is_of) {
             case "para":
               switch (obj.is_a) {
@@ -430,29 +432,30 @@ template outputEPub3() {
             }
             break;
           case "backmatter":
+            assert(part == "endnotes" || "glossary" || "bibliography" || "bookindex_seg" || "blurb" || "tail");
             switch (obj.is_of) {
             case "para":
               switch (obj.is_a) {
-              case "endnote":
+              case "endnote":             assert(part == "endnotes");
                 auto t = xhtml_format.para_seg(obj, _txt, suffix);
                 doc_epub3[segment_filename] ~= t[0];
                 break;
-              case "glossary":
+              case "glossary":            assert(part == "glossary");
                 auto t = xhtml_format.para_seg(obj, _txt, suffix);
                 doc_epub3[segment_filename] ~= t[0];
                 doc_epub3_endnotes[segment_filename] ~= t[1];
                 break;
-              case "bibliography":
+              case "bibliography":        assert(part == "bibliography");
                 auto t = xhtml_format.para_seg(obj, _txt, suffix);
                 doc_epub3[segment_filename] ~= t[0];
                 doc_epub3_endnotes[segment_filename] ~= t[1];
                 break;
-              case "bookindex":
+              case "bookindex":           assert(part == "bookindex_seg");
                 auto t = xhtml_format.para_seg(obj, _txt, suffix);
                 doc_epub3[segment_filename] ~= t[0];
                 doc_epub3_endnotes[segment_filename] ~= t[1];
                 break;
-              case "blurb":
+              case "blurb":               assert(part == "blurb");
                 auto t = xhtml_format.para_seg(obj, _txt, suffix);
                 doc_epub3[segment_filename] ~= t[0];
                 doc_epub3_endnotes[segment_filename] ~= t[1];