epub, work on

11 files changed, 77 insertions, 320 deletions

diff --git a/org/default_misc.org b/org/default_misc.org
index 5c71dee..429e13a 100644
--- a/org/default_misc.org
+++ b/org/default_misc.org
@@ -237,7 +237,7 @@ template InternalMarkup() {
     string mark_internal_site_lnk = "¤";
     string nbsp                   = "░";
     string br_line                = "┘";
-    string br_nl                  = "┙";
+    string br_newline_inline      = "┙";
     string br_paragraph           = "┚";
     string br_obj                 = "break_obj";
     string br_page_line           = "┼";
diff --git a/org/default_regex.org b/org/default_regex.org
index 6734b62..636d767 100644
--- a/org/default_regex.org
+++ b/org/default_regex.org
@@ -105,6 +105,7 @@ static trailing_linebreak                             = ctRegex!(",[ ]{1,2}\\\\\
 static newline_eol_delimiter                          = ctRegex!("\n");
 static newline_eol_strip_preceding                    = ctRegex!("[ ]*\n");
 static newline_eol_delimiter_only                     = ctRegex!("^\n");
+static markup_inline_linebreak                        = ctRegex!(`\s*\\\\s*`, "m");
 static line_delimiter_ws_strip                        = ctRegex!("[ ]*\n[ ]*");
 static para_delimiter                                 = ctRegex!("\n[ ]*\n+");
 static table_col_delimiter                            = ctRegex!("[ ]*\n+", "mg");
@@ -526,7 +527,7 @@ static src_formalised_file_path_parts                 = ctRegex!(`(?P<pth>(?:[/a
 static br_empty_line                                  = ctRegex!(`\n[ ]*\n`, "mg");
 static br_newlines_linebreaks                         = ctRegex!(`[\n┘┙]`, "mg");
 static br_line                                        = ctRegex!(`┘`, "mg");
-static br_nl                                          = ctRegex!(`┙`, "mg");
+static br_newline_inline                              = ctRegex!(`┙`, "mg");
 #+END_SRC
 
 *** inline (internal program) markup footnotes endnotes :inline:footnote:
diff --git a/org/metaverse.org b/org/metaverse.org
index b97bd2f..a3896c2 100644
--- a/org/metaverse.org
+++ b/org/metaverse.org
@@ -5170,11 +5170,11 @@ if (pith["block_is"] == eN.blk_is.quote) {
         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_nl
+            ~ mkup.br_newline_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_nl))
+            (conf_make_meta.meta.title_full ~ mkup.br_newline_inline))
           .replaceFirst(rgx.variable_doc_author,
             conf_make_meta.meta.creator_author)
           .replaceFirst(rgx.variable_doc_date,
@@ -5185,10 +5185,10 @@ if (pith["block_is"] == eN.blk_is.quote) {
         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_nl
+            ~ mkup.br_newline_inline
             ~ conf_make_meta.meta.creator_author))
           .replaceFirst(rgx.variable_doc_title,
-            (conf_make_meta.meta.title_full ~ mkup.br_nl))
+            (conf_make_meta.meta.title_full ~ mkup.br_newline_inline))
           .replaceFirst(rgx.variable_doc_author,
             conf_make_meta.meta.creator_author);
       } else if (an_object[an_object_key].match(rgx.variable_doc_title)) {
@@ -5893,6 +5893,7 @@ invariant() {
   obj_txt["munge"] = obj_txt_in
    .replaceFirst(rgx.headings, "")
    .replaceFirst(rgx.object_number_off_all, "")
+   .replaceFirst(rgx.markup_inline_linebreak, mkup.br_newline_inline)
    .strip;
   TxtPlusHasFootnotesUrlsImages t = object_notes_and_links_(obj_txt["munge"], reset_note_numbers);
   debug(munge) {
@@ -5923,7 +5924,8 @@ invariant() {
 @safe auto munge_para()(string obj_txt_in) {
   obj_txt["munge"] = (obj_txt_in)
     .replaceFirst(rgx.para_attribs, "")
-    .replaceFirst(rgx.object_number_off_all, "");
+    .replaceFirst(rgx.object_number_off_all, "")
+    .replaceFirst(rgx.markup_inline_linebreak, mkup.br_newline_inline);
   TxtPlusHasFootnotesUrlsImages t = object_notes_and_links_(obj_txt["munge"]);
   debug(munge) {
     writeln(__LINE__);
diff --git a/org/out_xmls.org b/org/out_xmls.org
index 84c15db..0e9bafe 100644
--- a/org/out_xmls.org
+++ b/org/out_xmls.org
@@ -159,8 +159,7 @@ import
     .replaceAll(rgx.xhtml_quotation,    "&quot;") // "&#34;"
     .replaceAll(rgx.xhtml_less_than,    "&lt;")   // "&#60;"
     .replaceAll(rgx.xhtml_greater_than, "&gt;")   // "&#62;"
-    .replaceAll(rgx.br_line,            "<br>")
-    .replaceAll(rgx.br_nl,              "<br>")
+    .replaceAll(rgx.br_line,            "<br />")
     .replaceAll(rgx.nbsp_char,          " ");
   return _txt;
 }
@@ -173,8 +172,7 @@ import
 @safe string special_characters_date(string _txt) {
   _txt = _txt
     .replaceAll(regex(r"(?:-00)+"),     "")
-    .replaceAll(rgx.br_line,            "<br>")
-    .replaceAll(rgx.br_nl,              "<br>")
+    .replaceAll(rgx.br_line,            "<br />")
     .replaceAll(rgx.nbsp_char,          " ");
   return _txt;
 }
@@ -334,7 +332,7 @@ import
       .replaceAll(
         rgx.br_line, "")
       .replaceAll(
-        rgx.br_nl, "");
+        rgx.br_newline_inline, "");
   } else {
      _locations = "<p class=\"tiny_left\"><a href=\"https://www.doc-reform.org\">spine</a></p>\n<p class=\"tiny_left\"><a href=\"https://git.sisudoc.org/software/spine/\">sources / git</a></p>\n<p class=\"tiny_left\"><a href=\"https://www.sisudoc.org\">www.sisudoc.org</a></p>";
   }
@@ -999,14 +997,16 @@ import
       (doc_matters.opt.action.ocn_off)
         ? "" : ((obj.metainfo.object_number.empty)
           ? "" : obj.metainfo.identifier),
-      obj.metainfo.heading_lev_markup,
+      ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+      : obj.metainfo.heading_lev_markup),
       obj.metainfo.is_a,
       obj.metainfo.identifier,
       obj.metainfo.identifier,
       tags,
       heading_lev_anchor_tag,
       _txt,
-      obj.metainfo.heading_lev_markup,
+      ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+      : obj.metainfo.heading_lev_markup),
     );
   } else {
     o = format(q"┃%s
@@ -1016,12 +1016,14 @@ import
     </h%s>
   </div>┃",
       _horizontal_rule,
-      obj.metainfo.heading_lev_markup,
+      ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+      : obj.metainfo.heading_lev_markup),
       obj.metainfo.is_a,
       tags,
       heading_lev_anchor_tag,
       _txt,
-      obj.metainfo.heading_lev_markup,
+      ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+      : obj.metainfo.heading_lev_markup),
     );
   }
   return o;
@@ -2349,7 +2351,6 @@ template outputEPub3() {
   <<output_epub3_fixed_container_xml>>
   <<output_epub3_constructs_oebps_content>>
   <<output_epub3_constructs_oebps_toc_nav_xhtml>>
-  <<output_epub3_constructs_oebps_toc_ncx>>
   <<output_epub3_xhtml_seg_output>>
     <<output_epub3_xhtml_seg_output_loop>>
         <<output_epub3_xhtml_seg_object_is_heading>>
@@ -2440,8 +2441,7 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
     <dc:identifier id="bookid">urn:uuid:%s</dc:identifier>
   </metadata>
   <manifest>
-    <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
-    <link rel="stylesheet" href="%s" type="text/css" id="main-css" />
+    <item id="css" href="%s" media-type="text/css"/>
     <item id="nav" href="toc_nav.xhtml" media-type="application/xhtml+xml" properties="nav" />
 ┃",
     _uuid,
@@ -2473,7 +2473,7 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
     );
   }
   content ~= "  " ~ "</manifest>"         ~ "\n  ";
-  content ~= "  " ~ "<spine toc=\"ncx\">" ~ "\n  ";
+  content ~= "  " ~ "<spine>"             ~ "\n  ";
   content ~= parts["spine"];
   content ~= "  " ~ "</spine>"            ~ "\n  ";
   content ~= "  " ~ "<guide>"             ~ "\n  ";
@@ -2530,7 +2530,6 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
     <h1>Contents</h1>
   </header>
   <nav epub:type="toc" id="toc">
-  <ol>
     <li>┃",
           (doc_matters.conf_make_meta.meta.title_full).special_characters_text,
         );
@@ -2544,7 +2543,10 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
     </li>
 ┃",
           toc_head,
-          obj.text.replaceAll(rgx.inline_notes_al_gen, "").strip,
+          obj.text
+            .replaceAll(rgx.inline_notes_al_gen, "")
+            .replaceAll(rgx.br_newline_inline, "<br />")
+            .strip,
         );
       } else if (sect == "tail") { // skip
       } else if ((sect != "tail") && (obj.metainfo.is_a == "heading")) {
@@ -2602,7 +2604,7 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
               break;
             }
             if (n == 0) {
-              _toc_nav_tail ~="</nav>
+              _toc_nav_tail ~="  </nav>
 </section>
 </body>
 </html>\n";
@@ -2617,124 +2619,6 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
 }
 #+END_SRC
 
-**** TODO _doc navigation epub2_ (OEBPS/toc.ncx) navigable toc using Dom structure
-
-- toc.ncx (epub2 navigation document)
-  - (replaced in epub3 by a declared xhtml nav file, in our case toc_nav.xhtml)
-
-#+NAME: output_epub3_constructs_oebps_toc_ncx
-#+BEGIN_SRC d
-@safe string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
-  int counter_play_order = 0;
-  string _uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
-  auto markup = InlineMarkup();
-  static auto rgx = RgxO();
-  enum DomTags { none, open, close, close_and_open, open_still, }
-  string toc;
-  string toc_ = format(q"┃<?xml version="1.0" encoding="utf-8"?>
-<ncx xmlns="https://www.daisy.org/z3986/2005/ncx/" version="2005-1">
-<head>
-  <!-- four required metadata items (for all NCX documents,
-    (including the relaxed constraints of OPS 2.0) -->
-  <title>%s%s</title>
-  <link rel="stylesheet" href="Styles/epub.css" type="text/css" id="main-css" />
-  <meta name="dtb:uid" content="urn:uuid:%s" />
-  <meta name="dtb:depth" content="%s" />
-  <meta name="dtb:totalPageCount" content="0" />
-  <meta name="dtb:maxPageNumber" content="0" />
-</head>
-<docTitle>
-  <text>%s</text>
-</docTitle>
-<docAuthor>
-  <text>%s</text>
-</docAuthor>
-<navMap>┃",
-    (doc_matters.conf_make_meta.meta.title_full).special_characters_text,                          // title
-    (doc_matters.conf_make_meta.meta.creator_author.empty) ? ""
-      : " by " ~ (doc_matters.conf_make_meta.meta.creator_author).special_characters_text,         // author
-    _uuid,                                                                // uuid
-    "3",                                                                 // content depth
-    (doc_matters.conf_make_meta.meta.title_full).special_characters_text,                          // title
-    (doc_matters.conf_make_meta.meta.creator_author.empty) ? ""
-      : (doc_matters.conf_make_meta.meta.creator_author).special_characters_text,                  // author
-  );
-  string _toc_ncx_tail = "";
-  foreach (sect; doc_matters.has.keys_seq.seg) {
-    foreach (obj; doc_abstraction[sect]) {
-      if (sect == "head") { toc = toc_;
-      }
-      if (obj.metainfo.is_a == "heading") {
-        string _txt = obj.text.replaceAll(rgx.inline_notes_al_gen, "").strip.special_characters_text;
-        // writeln(_txt, " --- ", obj.metainfo.dom_structure_collapsed_tags_status); // DEBUG line
-        string hashtag = (obj.metainfo.heading_lev_markup <= 4) ? "" : ("#" ~ obj.metainfo.ocn.to!string);
-        foreach_reverse (k; 0 .. 7) {
-          switch (obj.metainfo.dom_structure_collapsed_tags_status[k]) { // for epub may need to construct for levels 1 to 4 only
-          case DomTags.close :
-            if (sect != "head") {
-              toc ~= "\n    </navPoint>"; // issue at start of some documents
-            }
-            break;
-          case DomTags.close_and_open :
-            toc ~= "\n    </navPoint>";
-            goto default;
-          case DomTags.open :
-            goto default;
-          default :
-            string _toc;
-            if ((obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open
-              || obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.close_and_open
-              // || obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open_still
-            )) {
-              ++counter_play_order;
-              _toc = format(q"┃
-  <navPoint class="chapter" id="navpoint" playOrder="%s">
-    <navLabel>
-      <text>%s</text>
-    </navLabel>
-    <content src="%s.xhtml%s" />┃",
-                counter_play_order,
-                _txt,
-                obj.tags.segment_anchor_tag_epub,
-                hashtag,
-              );
-            }
-            if (obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.close_and_open) {
-              toc ~= _toc;
-            } else if (obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open) {
-              toc ~= _toc;
-            }
-            break;
-          }
-          if (doc_matters.has.keys_seq.seg[doc_matters.has.keys_seq.seg.length - 2] == sect) {
-            if (k == 6) {_toc_ncx_tail = "";}
-            switch (obj.metainfo.dom_structure_collapsed_tags_status[k]) {
-            case 0: case 2:
-            // case DomTags.none: case DomTags.close:
-              break;
-            case 1: case 3: case 4:
-            // case DomTags.open: case DomTags.close_and_open: case DomTags.open_still:
-              if (k != 0) {
-              }
-              _toc_ncx_tail ~= "   " ~ markup.indent_by_spaces_provided(k, "  ") ~ "</navPoint>" ~ "\n";
-              break;
-            default :
-              break;
-            }
-            if (k == 0) {
-              _toc_ncx_tail ~= format(q"┃  </navMap>
-</ncx>┃");
-            }
-          }
-        }
-      }
-    }
-  }
-  toc ~= _toc_ncx_tail;
-  return toc;
-}
-#+END_SRC
-
 ** the document contents                                                :seg:
 *** ↻ loop & switch (sections & objects) format epub3 xhtml output
 
@@ -2756,7 +2640,6 @@ xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
     /+ fixed output +/
     string mimetypes;
     string meta_inf_container_xml;
-    string oebps_toc_ncx;
     string oebps_toc_nav_xhtml;
     /+ variable output +/
     string oebps_content_opf;
@@ -3052,25 +2935,25 @@ if (obj.metainfo.is_a == "heading") {
   assert(obj.text.length > 0);
   if (obj.metainfo.heading_lev_markup <= 4) {
     oepbs_content_parts["manifest_documents"] ~=
-      format(q"┃      <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
+      format(q"┃<item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
       obj.tags.segment_anchor_tag_epub,
     );
     oepbs_content_parts["spine"] ~=
-      format(q"┃    <itemref idref="%s.xhtml" linear="yes" />
+      format(q"┃<itemref idref="%s.xhtml" linear="yes" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
     );
     oepbs_content_parts["guide"] ~=
-      format(q"┃      <reference type="%s" href="%s" />
+      format(q"┃<reference type="%s" href="%s" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
       obj.tags.segment_anchor_tag_epub,
     );
   } else if (obj.metainfo.heading_lev_markup > 4) {
     oepbs_content_parts["manifest_documents"] ~=
-      format(q"┃      <item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
+      format(q"┃<item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
       obj.metainfo.object_number,
@@ -3078,13 +2961,13 @@ if (obj.metainfo.is_a == "heading") {
       obj.metainfo.object_number,
     );
     oepbs_content_parts["spine"] ~=
-      format(q"┃    <itemref idref="%s.xhtml#%s" linear="yes" />
+      format(q"┃<itemref idref="%s.xhtml#%s" linear="yes" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
       obj.metainfo.object_number,
     );
     oepbs_content_parts["guide"] ~=
-      format(q"┃      <reference type="%s#%s" href="%s#%s" />
+      format(q"┃<reference type="%s#%s" href="%s#%s" />
       ┃",
       obj.tags.segment_anchor_tag_epub,
       obj.metainfo.object_number,
@@ -3102,11 +2985,10 @@ if (obj.metainfo.is_a == "heading") {
     }
   }
   /+ epub specific documents +/
-  epubWrite.mimetypes =              epub3_mimetypes;
+  epubWrite.mimetypes              = epub3_mimetypes;
   epubWrite.meta_inf_container_xml = epub3_container_xml;
-  epubWrite.oebps_toc_ncx =          doc_abstraction.epub2_oebps_toc_ncx(doc_matters);
-  epubWrite.oebps_toc_nav_xhtml =    doc_abstraction.epub3_oebps_toc_nav_xhtml(doc_matters);
-  epubWrite.oebps_content_opf =      doc_abstraction.epub3_oebps_content(doc_matters, oepbs_content_parts);
+  epubWrite.oebps_toc_nav_xhtml    = doc_abstraction.epub3_oebps_toc_nav_xhtml(doc_matters);
+  epubWrite.oebps_content_opf      = doc_abstraction.epub3_oebps_content(doc_matters, oepbs_content_parts);
   epubWrite.epub3_write_output_files(doc_matters);
 }
 #+END_SRC
@@ -3127,7 +3009,6 @@ zip -0 file.epub mimetype && zip -r -9 file.epub META-INF OEBPS
     static assert(is(typeof(epub_write.mimetypes)              == string));
     static assert(is(typeof(epub_write.meta_inf_container_xml) == string));
     static assert(is(typeof(epub_write.oebps_toc_nav_xhtml)    == string));
-    static assert(is(typeof(epub_write.oebps_toc_ncx)          == string));
     static assert(is(typeof(epub_write.oebps_content_opf)      == string));
   }
   static auto rgx = RgxO();
@@ -3234,16 +3115,6 @@ zip -0 file.epub mimetype && zip -r -9 file.epub META-INF OEBPS
       fn = pth_epub3.fn_oebps_toc_nav_xhtml;
       EPUBzip(epub_write.oebps_toc_nav_xhtml, fn);
     }
-    { /+ OEBPS/toc.ncx (navigation toc epub2) +/
-      { /+ debug +/
-        if (doc_matters.opt.action.debug_do) {
-          fn_dbg = pth_epub3.dbg_fn_oebps_toc_ncx(doc_matters.src.filename);
-          File(fn_dbg, "w").writeln(epub_write.oebps_toc_ncx);
-        }
-      }
-      fn = pth_epub3.fn_oebps_toc_ncx;
-      EPUBzip(epub_write.oebps_toc_ncx, fn);
-    }
     { /+ OEBPS/content.opf (doc manifest) +/
       { /+ debug +/
         if (doc_matters.opt.action.debug_do) {
diff --git a/src/doc_reform/io_out/defaults.d b/src/doc_reform/io_out/defaults.d
index aedbbc1..6839c92 100644
--- a/src/doc_reform/io_out/defaults.d
+++ b/src/doc_reform/io_out/defaults.d
@@ -73,7 +73,7 @@ template InternalMarkup() {
     string mark_internal_site_lnk = "¤";
     string nbsp                   = "░";
     string br_line                = "┘";
-    string br_nl                  = "┙";
+    string br_newline_inline      = "┙";
     string br_paragraph           = "┚";
     string br_obj                 = "break_obj";
     string br_page_line           = "┼";
diff --git a/src/doc_reform/io_out/epub3.d b/src/doc_reform/io_out/epub3.d
index 6593db5..a49304f 100644
--- a/src/doc_reform/io_out/epub3.d
+++ b/src/doc_reform/io_out/epub3.d
@@ -70,8 +70,7 @@ template outputEPub3() {
       .replaceAll(rgx.xhtml_quotation,    "&quot;") // "&#34;"
       .replaceAll(rgx.xhtml_less_than,    "&lt;")   // "&#60;"
       .replaceAll(rgx.xhtml_greater_than, "&gt;")   // "&#62;"
-      .replaceAll(rgx.br_line,            "<br>")
-      .replaceAll(rgx.br_nl,              "<br>")
+      .replaceAll(rgx.br_line,            "<br />")
       .replaceAll(rgx.nbsp_char,          " ");
     return _txt;
   }
@@ -114,8 +113,7 @@ template outputEPub3() {
       <dc:identifier id="bookid">urn:uuid:%s</dc:identifier>
     </metadata>
     <manifest>
-      <item id="ncx" href="toc.ncx" media-type="application/x-dtbncx+xml" />
-      <link rel="stylesheet" href="%s" type="text/css" id="main-css" />
+      <item id="css" href="%s" media-type="text/css"/>
       <item id="nav" href="toc_nav.xhtml" media-type="application/xhtml+xml" properties="nav" />
   ┃",
       _uuid,
@@ -147,7 +145,7 @@ template outputEPub3() {
       );
     }
     content ~= "  " ~ "</manifest>"         ~ "\n  ";
-    content ~= "  " ~ "<spine toc=\"ncx\">" ~ "\n  ";
+    content ~= "  " ~ "<spine>"             ~ "\n  ";
     content ~= parts["spine"];
     content ~= "  " ~ "</spine>"            ~ "\n  ";
     content ~= "  " ~ "<guide>"             ~ "\n  ";
@@ -196,7 +194,6 @@ template outputEPub3() {
       <h1>Contents</h1>
     </header>
     <nav epub:type="toc" id="toc">
-    <ol>
       <li>┃",
             (doc_matters.conf_make_meta.meta.title_full).special_characters_text,
           );
@@ -210,7 +207,10 @@ template outputEPub3() {
       </li>
   ┃",
             toc_head,
-            obj.text.replaceAll(rgx.inline_notes_al_gen, "").strip,
+            obj.text
+              .replaceAll(rgx.inline_notes_al_gen, "")
+              .replaceAll(rgx.br_newline_inline, "<br />")
+              .strip,
           );
         } else if (sect == "tail") { // skip
         } else if ((sect != "tail") && (obj.metainfo.is_a == "heading")) {
@@ -268,7 +268,7 @@ template outputEPub3() {
                 break;
               }
               if (n == 0) {
-                _toc_nav_tail ~="</nav>
+                _toc_nav_tail ~="  </nav>
   </section>
   </body>
   </html>\n";
@@ -281,115 +281,6 @@ template outputEPub3() {
     toc ~= _toc_nav_tail;
     return toc;
   }
-  @safe string epub2_oebps_toc_ncx(D,I)(D doc_abstraction, I doc_matters) {
-    int counter_play_order = 0;
-    string _uuid = "18275d951861c77f78acd05672c9906924c59f18a2e0ba06dad95959693e9bd8"; // TODO shared elsewhere
-    auto markup = InlineMarkup();
-    static auto rgx = RgxO();
-    enum DomTags { none, open, close, close_and_open, open_still, }
-    string toc;
-    string toc_ = format(q"┃<?xml version="1.0" encoding="utf-8"?>
-  <ncx xmlns="https://www.daisy.org/z3986/2005/ncx/" version="2005-1">
-  <head>
-    <!-- four required metadata items (for all NCX documents,
-      (including the relaxed constraints of OPS 2.0) -->
-    <title>%s%s</title>
-    <link rel="stylesheet" href="Styles/epub.css" type="text/css" id="main-css" />
-    <meta name="dtb:uid" content="urn:uuid:%s" />
-    <meta name="dtb:depth" content="%s" />
-    <meta name="dtb:totalPageCount" content="0" />
-    <meta name="dtb:maxPageNumber" content="0" />
-  </head>
-  <docTitle>
-    <text>%s</text>
-  </docTitle>
-  <docAuthor>
-    <text>%s</text>
-  </docAuthor>
-  <navMap>┃",
-      (doc_matters.conf_make_meta.meta.title_full).special_characters_text,                          // title
-      (doc_matters.conf_make_meta.meta.creator_author.empty) ? ""
-        : " by " ~ (doc_matters.conf_make_meta.meta.creator_author).special_characters_text,         // author
-      _uuid,                                                                // uuid
-      "3",                                                                 // content depth
-      (doc_matters.conf_make_meta.meta.title_full).special_characters_text,                          // title
-      (doc_matters.conf_make_meta.meta.creator_author.empty) ? ""
-        : (doc_matters.conf_make_meta.meta.creator_author).special_characters_text,                  // author
-    );
-    string _toc_ncx_tail = "";
-    foreach (sect; doc_matters.has.keys_seq.seg) {
-      foreach (obj; doc_abstraction[sect]) {
-        if (sect == "head") { toc = toc_;
-        }
-        if (obj.metainfo.is_a == "heading") {
-          string _txt = obj.text.replaceAll(rgx.inline_notes_al_gen, "").strip.special_characters_text;
-          // writeln(_txt, " --- ", obj.metainfo.dom_structure_collapsed_tags_status); // DEBUG line
-          string hashtag = (obj.metainfo.heading_lev_markup <= 4) ? "" : ("#" ~ obj.metainfo.ocn.to!string);
-          foreach_reverse (k; 0 .. 7) {
-            switch (obj.metainfo.dom_structure_collapsed_tags_status[k]) { // for epub may need to construct for levels 1 to 4 only
-            case DomTags.close :
-              if (sect != "head") {
-                toc ~= "\n    </navPoint>"; // issue at start of some documents
-              }
-              break;
-            case DomTags.close_and_open :
-              toc ~= "\n    </navPoint>";
-              goto default;
-            case DomTags.open :
-              goto default;
-            default :
-              string _toc;
-              if ((obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open
-                || obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.close_and_open
-                // || obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open_still
-              )) {
-                ++counter_play_order;
-                _toc = format(q"┃
-    <navPoint class="chapter" id="navpoint" playOrder="%s">
-      <navLabel>
-        <text>%s</text>
-      </navLabel>
-      <content src="%s.xhtml%s" />┃",
-                  counter_play_order,
-                  _txt,
-                  obj.tags.segment_anchor_tag_epub,
-                  hashtag,
-                );
-              }
-              if (obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.close_and_open) {
-                toc ~= _toc;
-              } else if (obj.metainfo.dom_structure_collapsed_tags_status[k] == DomTags.open) {
-                toc ~= _toc;
-              }
-              break;
-            }
-            if (doc_matters.has.keys_seq.seg[doc_matters.has.keys_seq.seg.length - 2] == sect) {
-              if (k == 6) {_toc_ncx_tail = "";}
-              switch (obj.metainfo.dom_structure_collapsed_tags_status[k]) {
-              case 0: case 2:
-              // case DomTags.none: case DomTags.close:
-                break;
-              case 1: case 3: case 4:
-              // case DomTags.open: case DomTags.close_and_open: case DomTags.open_still:
-                if (k != 0) {
-                }
-                _toc_ncx_tail ~= "   " ~ markup.indent_by_spaces_provided(k, "  ") ~ "</navPoint>" ~ "\n";
-                break;
-              default :
-                break;
-              }
-              if (k == 0) {
-                _toc_ncx_tail ~= format(q"┃  </navMap>
-  </ncx>┃");
-              }
-            }
-          }
-        }
-      }
-    }
-    toc ~= _toc_ncx_tail;
-    return toc;
-  }
   @system void outputEPub3(D,I)(
     const D    doc_abstraction,
           I    doc_matters,
@@ -406,7 +297,6 @@ template outputEPub3() {
       /+ fixed output +/
       string mimetypes;
       string meta_inf_container_xml;
-      string oebps_toc_ncx;
       string oebps_toc_nav_xhtml;
       /+ variable output +/
       string oebps_content_opf;
@@ -654,25 +544,25 @@ template outputEPub3() {
           assert(obj.text.length > 0);
           if (obj.metainfo.heading_lev_markup <= 4) {
             oepbs_content_parts["manifest_documents"] ~=
-              format(q"┃      <item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
+              format(q"┃<item id="%s.xhtml" href="%s.xhtml" media-type="application/xhtml+xml" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
               obj.tags.segment_anchor_tag_epub,
             );
             oepbs_content_parts["spine"] ~=
-              format(q"┃    <itemref idref="%s.xhtml" linear="yes" />
+              format(q"┃<itemref idref="%s.xhtml" linear="yes" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
             );
             oepbs_content_parts["guide"] ~=
-              format(q"┃      <reference type="%s" href="%s" />
+              format(q"┃<reference type="%s" href="%s" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
               obj.tags.segment_anchor_tag_epub,
             );
           } else if (obj.metainfo.heading_lev_markup > 4) {
             oepbs_content_parts["manifest_documents"] ~=
-              format(q"┃      <item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
+              format(q"┃<item id="%s.xhtml#%s" href="%s.xhtml#%s" media-type="application/xhtml+xml" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
               obj.metainfo.object_number,
@@ -680,13 +570,13 @@ template outputEPub3() {
               obj.metainfo.object_number,
             );
             oepbs_content_parts["spine"] ~=
-              format(q"┃    <itemref idref="%s.xhtml#%s" linear="yes" />
+              format(q"┃<itemref idref="%s.xhtml#%s" linear="yes" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
               obj.metainfo.object_number,
             );
             oepbs_content_parts["guide"] ~=
-              format(q"┃      <reference type="%s#%s" href="%s#%s" />
+              format(q"┃<reference type="%s#%s" href="%s#%s" />
               ┃",
               obj.tags.segment_anchor_tag_epub,
               obj.metainfo.object_number,
@@ -698,11 +588,10 @@ template outputEPub3() {
       }
     }
     /+ epub specific documents +/
-    epubWrite.mimetypes =              epub3_mimetypes;
+    epubWrite.mimetypes              = epub3_mimetypes;
     epubWrite.meta_inf_container_xml = epub3_container_xml;
-    epubWrite.oebps_toc_ncx =          doc_abstraction.epub2_oebps_toc_ncx(doc_matters);
-    epubWrite.oebps_toc_nav_xhtml =    doc_abstraction.epub3_oebps_toc_nav_xhtml(doc_matters);
-    epubWrite.oebps_content_opf =      doc_abstraction.epub3_oebps_content(doc_matters, oepbs_content_parts);
+    epubWrite.oebps_toc_nav_xhtml    = doc_abstraction.epub3_oebps_toc_nav_xhtml(doc_matters);
+    epubWrite.oebps_content_opf      = doc_abstraction.epub3_oebps_content(doc_matters, oepbs_content_parts);
     epubWrite.epub3_write_output_files(doc_matters);
   }
   @system void epub3_write_output_files(W,M)(
@@ -714,7 +603,6 @@ template outputEPub3() {
       static assert(is(typeof(epub_write.mimetypes)              == string));
       static assert(is(typeof(epub_write.meta_inf_container_xml) == string));
       static assert(is(typeof(epub_write.oebps_toc_nav_xhtml)    == string));
-      static assert(is(typeof(epub_write.oebps_toc_ncx)          == string));
       static assert(is(typeof(epub_write.oebps_content_opf)      == string));
     }
     static auto rgx = RgxO();
@@ -821,16 +709,6 @@ template outputEPub3() {
         fn = pth_epub3.fn_oebps_toc_nav_xhtml;
         EPUBzip(epub_write.oebps_toc_nav_xhtml, fn);
       }
-      { /+ OEBPS/toc.ncx (navigation toc epub2) +/
-        { /+ debug +/
-          if (doc_matters.opt.action.debug_do) {
-            fn_dbg = pth_epub3.dbg_fn_oebps_toc_ncx(doc_matters.src.filename);
-            File(fn_dbg, "w").writeln(epub_write.oebps_toc_ncx);
-          }
-        }
-        fn = pth_epub3.fn_oebps_toc_ncx;
-        EPUBzip(epub_write.oebps_toc_ncx, fn);
-      }
       { /+ OEBPS/content.opf (doc manifest) +/
         { /+ debug +/
           if (doc_matters.opt.action.debug_do) {
diff --git a/src/doc_reform/io_out/rgx.d b/src/doc_reform/io_out/rgx.d
index 7f3b9da..3aaf420 100644
--- a/src/doc_reform/io_out/rgx.d
+++ b/src/doc_reform/io_out/rgx.d
@@ -76,7 +76,7 @@ static template spineRgxOut() {
     static br_empty_line                                  = ctRegex!(`\n[ ]*\n`, "mg");
     static br_newlines_linebreaks                         = ctRegex!(`[\n┘┙]`, "mg");
     static br_line                                        = ctRegex!(`┘`, "mg");
-    static br_nl                                          = ctRegex!(`┙`, "mg");
+    static br_newline_inline                              = ctRegex!(`┙`, "mg");
     /+ inline markup footnotes endnotes +/
     static inline_notes_al                                = ctRegex!(`【(?:[*+]\s+|\s*)(.+?)】`, "mg");
     static inline_notes_al_special                        = ctRegex!(`【(?:[*+]\s+)(.+?)】`, "mg"); // TODO remove match when special footnotes are implemented
diff --git a/src/doc_reform/io_out/xmls.d b/src/doc_reform/io_out/xmls.d
index 66661cf..6191fa9 100644
--- a/src/doc_reform/io_out/xmls.d
+++ b/src/doc_reform/io_out/xmls.d
@@ -99,16 +99,14 @@ template outputXHTMLs() {
         .replaceAll(rgx.xhtml_quotation,    "&quot;") // "&#34;"
         .replaceAll(rgx.xhtml_less_than,    "&lt;")   // "&#60;"
         .replaceAll(rgx.xhtml_greater_than, "&gt;")   // "&#62;"
-        .replaceAll(rgx.br_line,            "<br>")
-        .replaceAll(rgx.br_nl,              "<br>")
+        .replaceAll(rgx.br_line,            "<br />")
         .replaceAll(rgx.nbsp_char,          " ");
       return _txt;
     }
     @safe string special_characters_date(string _txt) {
       _txt = _txt
         .replaceAll(regex(r"(?:-00)+"),     "")
-        .replaceAll(rgx.br_line,            "<br>")
-        .replaceAll(rgx.br_nl,              "<br>")
+        .replaceAll(rgx.br_line,            "<br />")
         .replaceAll(rgx.nbsp_char,          " ");
       return _txt;
     }
@@ -237,7 +235,7 @@ template outputXHTMLs() {
           .replaceAll(
             rgx.br_line, "")
           .replaceAll(
-            rgx.br_nl, "");
+            rgx.br_newline_inline, "");
       } else {
          _locations = "<p class=\"tiny_left\"><a href=\"https://www.doc-reform.org\">spine</a></p>\n<p class=\"tiny_left\"><a href=\"https://git.sisudoc.org/software/spine/\">sources / git</a></p>\n<p class=\"tiny_left\"><a href=\"https://www.sisudoc.org\">www.sisudoc.org</a></p>";
       }
@@ -812,14 +810,16 @@ template outputXHTMLs() {
           (doc_matters.opt.action.ocn_off)
             ? "" : ((obj.metainfo.object_number.empty)
               ? "" : obj.metainfo.identifier),
-          obj.metainfo.heading_lev_markup,
+          ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+          : obj.metainfo.heading_lev_markup),
           obj.metainfo.is_a,
           obj.metainfo.identifier,
           obj.metainfo.identifier,
           tags,
           heading_lev_anchor_tag,
           _txt,
-          obj.metainfo.heading_lev_markup,
+          ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+          : obj.metainfo.heading_lev_markup),
         );
       } else {
         o = format(q"┃%s
@@ -829,12 +829,14 @@ template outputXHTMLs() {
         </h%s>
       </div>┃",
           _horizontal_rule,
-          obj.metainfo.heading_lev_markup,
+          ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+          : obj.metainfo.heading_lev_markup),
           obj.metainfo.is_a,
           tags,
           heading_lev_anchor_tag,
           _txt,
-          obj.metainfo.heading_lev_markup,
+          ((_xml_type == "epub" && obj.metainfo.heading_lev_markup == 0) ? 1
+          : obj.metainfo.heading_lev_markup),
         );
       }
       return o;
diff --git a/src/doc_reform/meta/defaults.d b/src/doc_reform/meta/defaults.d
index 21c081c..ea969d5 100644
--- a/src/doc_reform/meta/defaults.d
+++ b/src/doc_reform/meta/defaults.d
@@ -184,7 +184,7 @@ template InternalMarkup() {
     string mark_internal_site_lnk = "¤";
     string nbsp                   = "░";
     string br_line                = "┘";
-    string br_nl                  = "┙";
+    string br_newline_inline      = "┙";
     string br_paragraph           = "┚";
     string br_obj                 = "break_obj";
     string br_page_line           = "┼";
diff --git a/src/doc_reform/meta/metadoc_from_src.d b/src/doc_reform/meta/metadoc_from_src.d
index 3099d84..6396655 100644
--- a/src/doc_reform/meta/metadoc_from_src.d
+++ b/src/doc_reform/meta/metadoc_from_src.d
@@ -4060,11 +4060,11 @@ template docAbstraction() {
           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_nl
+              ~ mkup.br_newline_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_nl))
+              (conf_make_meta.meta.title_full ~ mkup.br_newline_inline))
             .replaceFirst(rgx.variable_doc_author,
               conf_make_meta.meta.creator_author)
             .replaceFirst(rgx.variable_doc_date,
@@ -4075,10 +4075,10 @@ template docAbstraction() {
           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_nl
+              ~ mkup.br_newline_inline
               ~ conf_make_meta.meta.creator_author))
             .replaceFirst(rgx.variable_doc_title,
-              (conf_make_meta.meta.title_full ~ mkup.br_nl))
+              (conf_make_meta.meta.title_full ~ mkup.br_newline_inline))
             .replaceFirst(rgx.variable_doc_author,
               conf_make_meta.meta.creator_author);
         } else if (an_object[an_object_key].match(rgx.variable_doc_title)) {
@@ -4694,6 +4694,7 @@ template docAbstraction() {
       obj_txt["munge"] = obj_txt_in
        .replaceFirst(rgx.headings, "")
        .replaceFirst(rgx.object_number_off_all, "")
+       .replaceFirst(rgx.markup_inline_linebreak, mkup.br_newline_inline)
        .strip;
       TxtPlusHasFootnotesUrlsImages t = object_notes_and_links_(obj_txt["munge"], reset_note_numbers);
       debug(munge) {
@@ -4709,7 +4710,8 @@ template docAbstraction() {
     @safe auto munge_para()(string obj_txt_in) {
       obj_txt["munge"] = (obj_txt_in)
         .replaceFirst(rgx.para_attribs, "")
-        .replaceFirst(rgx.object_number_off_all, "");
+        .replaceFirst(rgx.object_number_off_all, "")
+        .replaceFirst(rgx.markup_inline_linebreak, mkup.br_newline_inline);
       TxtPlusHasFootnotesUrlsImages t = object_notes_and_links_(obj_txt["munge"]);
       debug(munge) {
         writeln(__LINE__);
diff --git a/src/doc_reform/meta/rgx.d b/src/doc_reform/meta/rgx.d
index 0d2912d..8c48eac 100644
--- a/src/doc_reform/meta/rgx.d
+++ b/src/doc_reform/meta/rgx.d
@@ -77,6 +77,7 @@ static template spineRgxIn() {
     static newline_eol_delimiter                          = ctRegex!("\n");
     static newline_eol_strip_preceding                    = ctRegex!("[ ]*\n");
     static newline_eol_delimiter_only                     = ctRegex!("^\n");
+    static markup_inline_linebreak                        = ctRegex!(`\s*\\\\s*`, "m");
     static line_delimiter_ws_strip                        = ctRegex!("[ ]*\n[ ]*");
     static para_delimiter                                 = ctRegex!("\n[ ]*\n+");
     static table_col_delimiter                            = ctRegex!("[ ]*\n+", "mg");
@@ -245,7 +246,7 @@ static template spineRgxIn() {
     static br_empty_line                                  = ctRegex!(`\n[ ]*\n`, "mg");
     static br_newlines_linebreaks                         = ctRegex!(`[\n┘┙]`, "mg");
     static br_line                                        = ctRegex!(`┘`, "mg");
-    static br_nl                                          = ctRegex!(`┙`, "mg");
+    static br_newline_inline                              = ctRegex!(`┙`, "mg");
     /+ inline markup footnotes endnotes +/
     static inline_notes_al                                = ctRegex!(`【(?:[*+]\s+|\s*)(.+?)】`, "mg");
     static inline_notes_al_special                        = ctRegex!(`【(?:[*+]\s+)(.+?)】`, "mg"); // TODO remove match when special footnotes are implemented