ocda a fix & ssp code-style use curly braces

ocda: fixed inverted object_number_off on body paragraphs

ssp: make use of curly braces (code-style)

(assisted by Claude-Code)

4 files changed, 294 insertions, 144 deletions

diff --git a/org/ocda.org b/org/ocda.org
index 25a5d8e..c815604 100644
--- a/org/ocda.org
+++ b/org/ocda.org
@@ -862,7 +862,7 @@ _loopMarkupSrcByLineStruct loopMarkupSrcByLine(
             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.identifier                   = obj_cite_digits.identifier;
-            comp_obj_.metainfo.object_number_off            = (obj_cite_digits.off == 0)   ? true : false; // TODO
+            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_.attrib.indent_hang                    = indent["hang_position"];
diff --git a/org/out_src_abstraction_ocda_peg_ssp.org b/org/out_src_abstraction_ocda_peg_ssp.org
index a14773e..099d81f 100644
--- a/org/out_src_abstraction_ocda_peg_ssp.org
+++ b/org/out_src_abstraction_ocda_peg_ssp.org
@@ -51,73 +51,104 @@ template spineAbstractionTxt() {
     /+ ↓ @meta block +/
     output ~= "@meta {";
     auto meta = doc_matters.conf_make_meta.meta;
-    if (meta.title_main.length > 0)
+    if (meta.title_main.length > 0) {
       output ~= "  title.main: " ~ meta.title_main;
-    if (meta.title_subtitle.length > 0)
+    }
+    if (meta.title_subtitle.length > 0) {
       output ~= "  title.subtitle: " ~ meta.title_subtitle;
-    if (meta.title_full.length > 0)
+    }
+    if (meta.title_full.length > 0) {
       output ~= "  title.full: " ~ meta.title_full;
-    if (meta.title_language.length > 0)
+    }
+    if (meta.title_language.length > 0) {
       output ~= "  title.language: " ~ meta.title_language;
-    if (meta.creator_author.length > 0)
+    }
+    if (meta.creator_author.length > 0) {
       output ~= "  creator.author: " ~ meta.creator_author;
-    if (meta.creator_author_surname.length > 0)
+    }
+    if (meta.creator_author_surname.length > 0) {
       output ~= "  creator.author_surname: " ~ meta.creator_author_surname;
-    if (meta.creator_author_surname_fn.length > 0)
+    }
+    if (meta.creator_author_surname_fn.length > 0) {
       output ~= "  creator.author_surname_fn: " ~ meta.creator_author_surname_fn;
-    if (meta.creator_author_email.length > 0)
+    }
+    if (meta.creator_author_email.length > 0) {
       output ~= "  creator.author_email: " ~ meta.creator_author_email;
-    if (meta.creator_illustrator.length > 0)
+    }
+    if (meta.creator_illustrator.length > 0) {
       output ~= "  creator.illustrator: " ~ meta.creator_illustrator;
-    if (meta.creator_translator.length > 0)
+    }
+    if (meta.creator_translator.length > 0) {
       output ~= "  creator.translator: " ~ meta.creator_translator;
-    if (meta.date_published.length > 0)
+    }
+    if (meta.date_published.length > 0) {
       output ~= "  date.published: " ~ meta.date_published;
-    if (meta.date_created.length > 0)
+    }
+    if (meta.date_created.length > 0) {
       output ~= "  date.created: " ~ meta.date_created;
-    if (meta.date_issued.length > 0)
+    }
+    if (meta.date_issued.length > 0) {
       output ~= "  date.issued: " ~ meta.date_issued;
-    if (meta.date_available.length > 0)
+    }
+    if (meta.date_available.length > 0) {
       output ~= "  date.available: " ~ meta.date_available;
-    if (meta.date_modified.length > 0)
+    }
+    if (meta.date_modified.length > 0) {
       output ~= "  date.modified: " ~ meta.date_modified;
-    if (meta.date_valid.length > 0)
+    }
+    if (meta.date_valid.length > 0) {
       output ~= "  date.valid: " ~ meta.date_valid;
-    if (meta.rights_copyright.length > 0)
+    }
+    if (meta.rights_copyright.length > 0) {
       output ~= "  rights.copyright: " ~ meta.rights_copyright;
-    if (meta.rights_license.length > 0)
+    }
+    if (meta.rights_license.length > 0) {
       output ~= "  rights.license: " ~ meta.rights_license;
-    if (meta.classify_topic_register.length > 0)
+    }
+    if (meta.classify_topic_register.length > 0) {
       output ~= "  classify.topic_register: " ~ meta.classify_topic_register;
-    if (meta.classify_subject.length > 0)
+    }
+    if (meta.classify_subject.length > 0) {
       output ~= "  classify.subject: " ~ meta.classify_subject;
-    if (meta.classify_keywords.length > 0)
+    }
+    if (meta.classify_keywords.length > 0) {
       output ~= "  classify.keywords: " ~ meta.classify_keywords;
-    if (meta.classify_loc.length > 0)
+    }
+    if (meta.classify_loc.length > 0) {
       output ~= "  classify.loc: " ~ meta.classify_loc;
-    if (meta.classify_dewey.length > 0)
+    }
+    if (meta.classify_dewey.length > 0) {
       output ~= "  classify.dewey: " ~ meta.classify_dewey;
-    if (meta.identifier_isbn.length > 0)
+    }
+    if (meta.identifier_isbn.length > 0) {
       output ~= "  identifier.isbn: " ~ meta.identifier_isbn;
-    if (meta.identifier_oclc.length > 0)
+    }
+    if (meta.identifier_oclc.length > 0) {
       output ~= "  identifier.oclc: " ~ meta.identifier_oclc;
-    if (meta.language_document.length > 0)
+    }
+    if (meta.language_document.length > 0) {
       output ~= "  language.document: " ~ meta.language_document;
-    if (meta.notes_abstract.length > 0)
+    }
+    if (meta.notes_abstract.length > 0) {
       output ~= "  notes.abstract: " ~ meta.notes_abstract;
-    if (meta.notes_description.length > 0)
+    }
+    if (meta.notes_description.length > 0) {
       output ~= "  notes.description: " ~ meta.notes_description;
-    if (meta.notes_summary.length > 0)
+    }
+    if (meta.notes_summary.length > 0) {
       output ~= "  notes.summary: " ~ meta.notes_summary;
+    } // check
     output ~= "}";
     output ~= "";
     /+ ↓ @make block +/
     output ~= "@make {";
     auto make = doc_matters.conf_make_meta.make;
-    if (make.doc_type.length > 0)
+    if (make.doc_type.length > 0) {
       output ~= "  doc_type: " ~ make.doc_type;
-    if (make.auto_num_top_at_level.length > 0)
+    }
+    if (make.auto_num_top_at_level.length > 0) {
       output ~= "  auto_num_top_at_level: " ~ make.auto_num_top_at_level;
+    } // check
     output ~= "  auto_num_top_lv: " ~ make.auto_num_top_lv.to!string;
     output ~= "  auto_num_depth: " ~ make.auto_num_depth.to!string;
     output ~= "}";
@@ -140,9 +171,9 @@ template spineAbstractionTxt() {
     string[] section_order = ["head", "toc", "body", "endnotes",
       "glossary", "bibliography", "bookindex", "blurb"];
     foreach (section; section_order) {
-      if (section !in doc_abstraction) continue;
+      if (section !in doc_abstraction) { continue; }
       auto section_objs = doc_abstraction[section];
-      if (section_objs.length == 0) continue;
+      if (section_objs.length == 0) { continue; }
       output ~= "@" ~ section ~ " {";
       output ~= "";
       foreach (obj; section_objs) {
@@ -160,15 +191,33 @@ template spineAbstractionTxt() {
         }
         output ~= obj_decl;
         /+ ↓ properties (only non-default values) +/
-        if (obj.metainfo.is_of_part.length > 0)
+        if (obj.metainfo.is_of_part.length > 0) {
           output ~= ".part: " ~ obj.metainfo.is_of_part;
+        }
         if (obj.metainfo.is_of_section.length > 0
-          && obj.metainfo.is_of_section != section)
+          && obj.metainfo.is_of_section != section) {
           output ~= ".section: " ~ obj.metainfo.is_of_section;
-        if (obj.metainfo.parent_ocn != 0)
+        }
+        /+ ↓ parent: emitted for every object except:
+             - the document root, the one object that has no parent
+             - toc entries, generated furniture rather than authored objects,
+               whose place is given by their indent level; the toc heading
+               itself does carry its parent (the document root)
+             A parent ocn of 0 is not "no parent recorded", it is a parent
+             heading the author has made non-substantive (ocn suppressed, or a
+             dummy heading introduced to segment an output); it is structurally
+             truthful and is stated explicitly rather than omitted so that the
+             two cases remain distinguishable in the file
+        +/
+        if (!(obj.metainfo.is_a == "heading"
+          && obj.metainfo.heading_lev_markup == 0)
+          && obj.metainfo.is_a != "toc"
+        ) {
           output ~= ".parent: " ~ obj.metainfo.parent_ocn.to!string;
-        if (obj.metainfo.last_descendant_ocn != 0)
+        }
+        if (obj.metainfo.last_descendant_ocn != 0) {
           output ~= ".last_descendant: " ~ obj.metainfo.last_descendant_ocn.to!string;
+        }
         /+ ↓ child headings (from pre-computed map) +/
         if (obj.metainfo.children_headings.length > 0) {
           string[] ch;
@@ -186,7 +235,7 @@ template spineAbstractionTxt() {
           if (has_anc) {
             string anc;
             foreach (i, a; obj.metainfo.markedup_ancestors) {
-              if (i > 0) anc ~= " ";
+              if (i > 0) { anc ~= " "; }
               anc ~= a.to!string;
             }
             output ~= ".ancestors: " ~ anc;
@@ -216,7 +265,7 @@ template spineAbstractionTxt() {
           if (has_dom) {
             string ds;
             foreach (i, d; obj.metainfo.dom_structure_markedup_tags_status) {
-              if (i > 0) ds ~= " ";
+              if (i > 0) { ds ~= " "; }
               ds ~= d.to!string;
             }
             output ~= ".dom_status: " ~ ds;
@@ -230,30 +279,39 @@ template spineAbstractionTxt() {
           if (has_dom_c) {
             string ds;
             foreach (i, d; obj.metainfo.dom_structure_collapsed_tags_status) {
-              if (i > 0) ds ~= " ";
+              if (i > 0) { ds ~= " "; }
               ds ~= d.to!string;
             }
             output ~= ".dom_status_collapsed: " ~ ds;
           }
         }
-        if (obj.metainfo.heading_lev_collapsed < 9)
+        if (obj.metainfo.heading_lev_collapsed < 9) {
           output ~= ".heading_lev_collapsed: " ~ obj.metainfo.heading_lev_collapsed.to!string;
-        if (obj.metainfo.parent_lev_markup != 0)
+        }
+        if (obj.metainfo.parent_lev_markup != 0) {
           output ~= ".parent_lev: " ~ obj.metainfo.parent_lev_markup.to!string;
-        if (obj.metainfo.dummy_heading)
+        }
+        if (obj.metainfo.dummy_heading) {
           output ~= ".dummy: true";
-        if (obj.metainfo.object_number_off)
+        }
+        if (obj.metainfo.object_number_off) {
           output ~= ".ocn_off: true";
-        if (obj.metainfo.o_n_type != 0)
+        }
+        if (obj.metainfo.o_n_type != 0) {
           output ~= ".o_n_type: " ~ obj.metainfo.o_n_type.to!string;
-        if (obj.metainfo.is_of_type.length > 0)
+        }
+        if (obj.metainfo.is_of_type.length > 0) {
           output ~= ".is_of_type: " ~ obj.metainfo.is_of_type;
-        if (obj.metainfo.attrib.length > 0)
+        }
+        if (obj.metainfo.attrib.length > 0) {
           output ~= ".attrib: " ~ obj.metainfo.attrib;
-        if (obj.metainfo.lang.length > 0)
+        }
+        if (obj.metainfo.lang.length > 0) {
           output ~= ".meta_lang: " ~ obj.metainfo.lang;
-        if (obj.metainfo.syntax.length > 0)
+        }
+        if (obj.metainfo.syntax.length > 0) {
           output ~= ".meta_syntax: " ~ obj.metainfo.syntax;
+        }
         /+ ↓ sha256 digest +/
         {
           bool has_sha = false;
@@ -291,23 +349,27 @@ template spineAbstractionTxt() {
           }
         }
         /+ ↓ text attributes +/
-        if (obj.attrib.indent_base != 0 || obj.attrib.indent_hang != 0)
+        if (obj.attrib.indent_base != 0 || obj.attrib.indent_hang != 0) {
           output ~= ".indent: " ~ obj.attrib.indent_base.to!string
             ~ " " ~ obj.attrib.indent_hang.to!string;
-        if (obj.attrib.bullet)
+        }
+        if (obj.attrib.bullet) {
           output ~= ".bullet: true";
-        if (obj.attrib.language.length > 0)
+        }
+        if (obj.attrib.language.length > 0) {
           output ~= ".lang: " ~ obj.attrib.language;
+        }
         /+ ↓ has flags +/
         {
           string[] has_flags;
-          if (obj.has.inline_links) has_flags ~= "links";
-          if (obj.has.inline_notes_reg) has_flags ~= "notes_reg";
-          if (obj.has.inline_notes_star) has_flags ~= "notes_star";
-          if (obj.has.images) has_flags ~= "images";
-          if (obj.has.image_without_dimensions) has_flags ~= "images_no_dim";
-          if (has_flags.length > 0)
+          if (obj.has.inline_links) { has_flags ~= "links"; }
+          if (obj.has.inline_notes_reg) { has_flags ~= "notes_reg"; }
+          if (obj.has.inline_notes_star) { has_flags ~= "notes_star"; }
+          if (obj.has.images) { has_flags ~= "images"; }
+          if (obj.has.image_without_dimensions) { has_flags ~= "images_no_dim"; }
+          if (has_flags.length > 0) {
             output ~= ".has: " ~ has_flags.join(" ");
+          }
         }
         /+ ↓ table properties +/
         if (obj.metainfo.is_a == "table" && obj.table.number_of_columns > 0) {
@@ -320,39 +382,50 @@ template spineAbstractionTxt() {
           if (obj.table.column_aligns.length > 0) {
             output ~= ".table_aligns: " ~ obj.table.column_aligns.join(" ");
           }
-          if (obj.table.heading)
+          if (obj.table.heading) {
             output ~= ".table_header: true";
-          if (obj.table.walls)
+         }
+          if (obj.table.walls) {
             output ~= ".table_walls: true";
+         }
         }
         /+ ↓ code block properties +/
         if (obj.metainfo.is_a == "code") {
-          if (obj.code_block.syntax.length > 0)
+          if (obj.code_block.syntax.length > 0) {
             output ~= ".code_syntax: " ~ obj.code_block.syntax;
-          if (obj.code_block.linenumbers)
+          }
+          if (obj.code_block.linenumbers) {
             output ~= ".code_linenumbers: true";
+          }
         }
         /+ ↓ stow (extracted links) +/
         if (obj.stow.link.length > 0) {
           foreach (lnk; obj.stow.link) {
-            if (lnk.length > 0)
+            if (lnk.length > 0) {
               output ~= ".stow_link: " ~ lnk;
+            }
           }
         }
         /+ ↓ tag properties +/
-        if (obj.tags.in_segment_html.length > 0)
+        if (obj.tags.in_segment_html.length > 0) {
           output ~= ".segment: " ~ obj.tags.in_segment_html;
+        }
         if (obj.tags.anchor_tag_html.length > 0
-          && obj.tags.anchor_tag_html != obj.tags.in_segment_html)
+          && obj.tags.anchor_tag_html != obj.tags.in_segment_html) {
           output ~= ".anchor: " ~ obj.tags.anchor_tag_html;
-        if (obj.tags.segname_prev.length > 0)
+        }
+        if (obj.tags.segname_prev.length > 0) {
           output ~= ".segment_prev: " ~ obj.tags.segname_prev;
-        if (obj.tags.segname_next.length > 0)
+        }
+        if (obj.tags.segname_next.length > 0) {
           output ~= ".segment_next: " ~ obj.tags.segname_next;
-        if (obj.tags.heading_lev_anchor_tag.length > 0)
+        }
+        if (obj.tags.heading_lev_anchor_tag.length > 0) {
           output ~= ".heading_lev_anchor: " ~ obj.tags.heading_lev_anchor_tag;
-        if (obj.tags.segment_anchor_tag_epub.length > 0)
+        }
+        if (obj.tags.segment_anchor_tag_epub.length > 0) {
           output ~= ".segment_epub: " ~ obj.tags.segment_anchor_tag_epub;
+        }
         /+ ↓ heading ancestors text +/
         {
           bool has_hat = false;
@@ -366,15 +439,17 @@ template spineAbstractionTxt() {
         /+ ↓ lev4 subtoc +/
         if (obj.tags.lev4_subtoc.length > 0) {
           foreach (st; obj.tags.lev4_subtoc) {
-            if (st.length > 0)
+            if (st.length > 0) {
               output ~= ".lev4_subtoc: " ~ st;
+            }
           }
         }
         /+ ↓ anchor tags +/
         if (obj.tags.anchor_tags.length > 0) {
           foreach (at; obj.tags.anchor_tags) {
-            if (at.length > 0)
+            if (at.length > 0) {
               output ~= ".anchor_tag: " ~ at;
+            }
           }
         }
         /+ ↓ text content +/
diff --git a/src/sisudoc/ocda/abstraction/ssp.d b/src/sisudoc/ocda/abstraction/ssp.d
index 1d1ea22..5f510f3 100644
--- a/src/sisudoc/ocda/abstraction/ssp.d
+++ b/src/sisudoc/ocda/abstraction/ssp.d
@@ -69,73 +69,104 @@ template spineAbstractionTxt() {
     /+ ↓ @meta block +/
     output ~= "@meta {";
     auto meta = doc_matters.conf_make_meta.meta;
-    if (meta.title_main.length > 0)
+    if (meta.title_main.length > 0) {
       output ~= "  title.main: " ~ meta.title_main;
-    if (meta.title_subtitle.length > 0)
+    }
+    if (meta.title_subtitle.length > 0) {
       output ~= "  title.subtitle: " ~ meta.title_subtitle;
-    if (meta.title_full.length > 0)
+    }
+    if (meta.title_full.length > 0) {
       output ~= "  title.full: " ~ meta.title_full;
-    if (meta.title_language.length > 0)
+    }
+    if (meta.title_language.length > 0) {
       output ~= "  title.language: " ~ meta.title_language;
-    if (meta.creator_author.length > 0)
+    }
+    if (meta.creator_author.length > 0) {
       output ~= "  creator.author: " ~ meta.creator_author;
-    if (meta.creator_author_surname.length > 0)
+    }
+    if (meta.creator_author_surname.length > 0) {
       output ~= "  creator.author_surname: " ~ meta.creator_author_surname;
-    if (meta.creator_author_surname_fn.length > 0)
+    }
+    if (meta.creator_author_surname_fn.length > 0) {
       output ~= "  creator.author_surname_fn: " ~ meta.creator_author_surname_fn;
-    if (meta.creator_author_email.length > 0)
+    }
+    if (meta.creator_author_email.length > 0) {
       output ~= "  creator.author_email: " ~ meta.creator_author_email;
-    if (meta.creator_illustrator.length > 0)
+    }
+    if (meta.creator_illustrator.length > 0) {
       output ~= "  creator.illustrator: " ~ meta.creator_illustrator;
-    if (meta.creator_translator.length > 0)
+    }
+    if (meta.creator_translator.length > 0) {
       output ~= "  creator.translator: " ~ meta.creator_translator;
-    if (meta.date_published.length > 0)
+    }
+    if (meta.date_published.length > 0) {
       output ~= "  date.published: " ~ meta.date_published;
-    if (meta.date_created.length > 0)
+    }
+    if (meta.date_created.length > 0) {
       output ~= "  date.created: " ~ meta.date_created;
-    if (meta.date_issued.length > 0)
+    }
+    if (meta.date_issued.length > 0) {
       output ~= "  date.issued: " ~ meta.date_issued;
-    if (meta.date_available.length > 0)
+    }
+    if (meta.date_available.length > 0) {
       output ~= "  date.available: " ~ meta.date_available;
-    if (meta.date_modified.length > 0)
+    }
+    if (meta.date_modified.length > 0) {
       output ~= "  date.modified: " ~ meta.date_modified;
-    if (meta.date_valid.length > 0)
+    }
+    if (meta.date_valid.length > 0) {
       output ~= "  date.valid: " ~ meta.date_valid;
-    if (meta.rights_copyright.length > 0)
+    }
+    if (meta.rights_copyright.length > 0) {
       output ~= "  rights.copyright: " ~ meta.rights_copyright;
-    if (meta.rights_license.length > 0)
+    }
+    if (meta.rights_license.length > 0) {
       output ~= "  rights.license: " ~ meta.rights_license;
-    if (meta.classify_topic_register.length > 0)
+    }
+    if (meta.classify_topic_register.length > 0) {
       output ~= "  classify.topic_register: " ~ meta.classify_topic_register;
-    if (meta.classify_subject.length > 0)
+    }
+    if (meta.classify_subject.length > 0) {
       output ~= "  classify.subject: " ~ meta.classify_subject;
-    if (meta.classify_keywords.length > 0)
+    }
+    if (meta.classify_keywords.length > 0) {
       output ~= "  classify.keywords: " ~ meta.classify_keywords;
-    if (meta.classify_loc.length > 0)
+    }
+    if (meta.classify_loc.length > 0) {
       output ~= "  classify.loc: " ~ meta.classify_loc;
-    if (meta.classify_dewey.length > 0)
+    }
+    if (meta.classify_dewey.length > 0) {
       output ~= "  classify.dewey: " ~ meta.classify_dewey;
-    if (meta.identifier_isbn.length > 0)
+    }
+    if (meta.identifier_isbn.length > 0) {
       output ~= "  identifier.isbn: " ~ meta.identifier_isbn;
-    if (meta.identifier_oclc.length > 0)
+    }
+    if (meta.identifier_oclc.length > 0) {
       output ~= "  identifier.oclc: " ~ meta.identifier_oclc;
-    if (meta.language_document.length > 0)
+    }
+    if (meta.language_document.length > 0) {
       output ~= "  language.document: " ~ meta.language_document;
-    if (meta.notes_abstract.length > 0)
+    }
+    if (meta.notes_abstract.length > 0) {
       output ~= "  notes.abstract: " ~ meta.notes_abstract;
-    if (meta.notes_description.length > 0)
+    }
+    if (meta.notes_description.length > 0) {
       output ~= "  notes.description: " ~ meta.notes_description;
-    if (meta.notes_summary.length > 0)
+    }
+    if (meta.notes_summary.length > 0) {
       output ~= "  notes.summary: " ~ meta.notes_summary;
+    } // check
     output ~= "}";
     output ~= "";
     /+ ↓ @make block +/
     output ~= "@make {";
     auto make = doc_matters.conf_make_meta.make;
-    if (make.doc_type.length > 0)
+    if (make.doc_type.length > 0) {
       output ~= "  doc_type: " ~ make.doc_type;
-    if (make.auto_num_top_at_level.length > 0)
+    }
+    if (make.auto_num_top_at_level.length > 0) {
       output ~= "  auto_num_top_at_level: " ~ make.auto_num_top_at_level;
+    } // check
     output ~= "  auto_num_top_lv: " ~ make.auto_num_top_lv.to!string;
     output ~= "  auto_num_depth: " ~ make.auto_num_depth.to!string;
     output ~= "}";
@@ -158,9 +189,9 @@ template spineAbstractionTxt() {
     string[] section_order = ["head", "toc", "body", "endnotes",
       "glossary", "bibliography", "bookindex", "blurb"];
     foreach (section; section_order) {
-      if (section !in doc_abstraction) continue;
+      if (section !in doc_abstraction) { continue; }
       auto section_objs = doc_abstraction[section];
-      if (section_objs.length == 0) continue;
+      if (section_objs.length == 0) { continue; }
       output ~= "@" ~ section ~ " {";
       output ~= "";
       foreach (obj; section_objs) {
@@ -178,15 +209,33 @@ template spineAbstractionTxt() {
         }
         output ~= obj_decl;
         /+ ↓ properties (only non-default values) +/
-        if (obj.metainfo.is_of_part.length > 0)
+        if (obj.metainfo.is_of_part.length > 0) {
           output ~= ".part: " ~ obj.metainfo.is_of_part;
+        }
         if (obj.metainfo.is_of_section.length > 0
-          && obj.metainfo.is_of_section != section)
+          && obj.metainfo.is_of_section != section) {
           output ~= ".section: " ~ obj.metainfo.is_of_section;
-        if (obj.metainfo.parent_ocn != 0)
+        }
+        /+ ↓ parent: emitted for every object except:
+             - the document root, the one object that has no parent
+             - toc entries, generated furniture rather than authored objects,
+               whose place is given by their indent level; the toc heading
+               itself does carry its parent (the document root)
+             A parent ocn of 0 is not "no parent recorded", it is a parent
+             heading the author has made non-substantive (ocn suppressed, or a
+             dummy heading introduced to segment an output); it is structurally
+             truthful and is stated explicitly rather than omitted so that the
+             two cases remain distinguishable in the file
+        +/
+        if (!(obj.metainfo.is_a == "heading"
+          && obj.metainfo.heading_lev_markup == 0)
+          && obj.metainfo.is_a != "toc"
+        ) {
           output ~= ".parent: " ~ obj.metainfo.parent_ocn.to!string;
-        if (obj.metainfo.last_descendant_ocn != 0)
+        }
+        if (obj.metainfo.last_descendant_ocn != 0) {
           output ~= ".last_descendant: " ~ obj.metainfo.last_descendant_ocn.to!string;
+        }
         /+ ↓ child headings (from pre-computed map) +/
         if (obj.metainfo.children_headings.length > 0) {
           string[] ch;
@@ -204,7 +253,7 @@ template spineAbstractionTxt() {
           if (has_anc) {
             string anc;
             foreach (i, a; obj.metainfo.markedup_ancestors) {
-              if (i > 0) anc ~= " ";
+              if (i > 0) { anc ~= " "; }
               anc ~= a.to!string;
             }
             output ~= ".ancestors: " ~ anc;
@@ -234,7 +283,7 @@ template spineAbstractionTxt() {
           if (has_dom) {
             string ds;
             foreach (i, d; obj.metainfo.dom_structure_markedup_tags_status) {
-              if (i > 0) ds ~= " ";
+              if (i > 0) { ds ~= " "; }
               ds ~= d.to!string;
             }
             output ~= ".dom_status: " ~ ds;
@@ -248,30 +297,39 @@ template spineAbstractionTxt() {
           if (has_dom_c) {
             string ds;
             foreach (i, d; obj.metainfo.dom_structure_collapsed_tags_status) {
-              if (i > 0) ds ~= " ";
+              if (i > 0) { ds ~= " "; }
               ds ~= d.to!string;
             }
             output ~= ".dom_status_collapsed: " ~ ds;
           }
         }
-        if (obj.metainfo.heading_lev_collapsed < 9)
+        if (obj.metainfo.heading_lev_collapsed < 9) {
           output ~= ".heading_lev_collapsed: " ~ obj.metainfo.heading_lev_collapsed.to!string;
-        if (obj.metainfo.parent_lev_markup != 0)
+        }
+        if (obj.metainfo.parent_lev_markup != 0) {
           output ~= ".parent_lev: " ~ obj.metainfo.parent_lev_markup.to!string;
-        if (obj.metainfo.dummy_heading)
+        }
+        if (obj.metainfo.dummy_heading) {
           output ~= ".dummy: true";
-        if (obj.metainfo.object_number_off)
+        }
+        if (obj.metainfo.object_number_off) {
           output ~= ".ocn_off: true";
-        if (obj.metainfo.o_n_type != 0)
+        }
+        if (obj.metainfo.o_n_type != 0) {
           output ~= ".o_n_type: " ~ obj.metainfo.o_n_type.to!string;
-        if (obj.metainfo.is_of_type.length > 0)
+        }
+        if (obj.metainfo.is_of_type.length > 0) {
           output ~= ".is_of_type: " ~ obj.metainfo.is_of_type;
-        if (obj.metainfo.attrib.length > 0)
+        }
+        if (obj.metainfo.attrib.length > 0) {
           output ~= ".attrib: " ~ obj.metainfo.attrib;
-        if (obj.metainfo.lang.length > 0)
+        }
+        if (obj.metainfo.lang.length > 0) {
           output ~= ".meta_lang: " ~ obj.metainfo.lang;
-        if (obj.metainfo.syntax.length > 0)
+        }
+        if (obj.metainfo.syntax.length > 0) {
           output ~= ".meta_syntax: " ~ obj.metainfo.syntax;
+        }
         /+ ↓ sha256 digest +/
         {
           bool has_sha = false;
@@ -309,23 +367,27 @@ template spineAbstractionTxt() {
           }
         }
         /+ ↓ text attributes +/
-        if (obj.attrib.indent_base != 0 || obj.attrib.indent_hang != 0)
+        if (obj.attrib.indent_base != 0 || obj.attrib.indent_hang != 0) {
           output ~= ".indent: " ~ obj.attrib.indent_base.to!string
             ~ " " ~ obj.attrib.indent_hang.to!string;
-        if (obj.attrib.bullet)
+        }
+        if (obj.attrib.bullet) {
           output ~= ".bullet: true";
-        if (obj.attrib.language.length > 0)
+        }
+        if (obj.attrib.language.length > 0) {
           output ~= ".lang: " ~ obj.attrib.language;
+        }
         /+ ↓ has flags +/
         {
           string[] has_flags;
-          if (obj.has.inline_links) has_flags ~= "links";
-          if (obj.has.inline_notes_reg) has_flags ~= "notes_reg";
-          if (obj.has.inline_notes_star) has_flags ~= "notes_star";
-          if (obj.has.images) has_flags ~= "images";
-          if (obj.has.image_without_dimensions) has_flags ~= "images_no_dim";
-          if (has_flags.length > 0)
+          if (obj.has.inline_links) { has_flags ~= "links"; }
+          if (obj.has.inline_notes_reg) { has_flags ~= "notes_reg"; }
+          if (obj.has.inline_notes_star) { has_flags ~= "notes_star"; }
+          if (obj.has.images) { has_flags ~= "images"; }
+          if (obj.has.image_without_dimensions) { has_flags ~= "images_no_dim"; }
+          if (has_flags.length > 0) {
             output ~= ".has: " ~ has_flags.join(" ");
+          }
         }
         /+ ↓ table properties +/
         if (obj.metainfo.is_a == "table" && obj.table.number_of_columns > 0) {
@@ -338,39 +400,50 @@ template spineAbstractionTxt() {
           if (obj.table.column_aligns.length > 0) {
             output ~= ".table_aligns: " ~ obj.table.column_aligns.join(" ");
           }
-          if (obj.table.heading)
+          if (obj.table.heading) {
             output ~= ".table_header: true";
-          if (obj.table.walls)
+         }
+          if (obj.table.walls) {
             output ~= ".table_walls: true";
+         }
         }
         /+ ↓ code block properties +/
         if (obj.metainfo.is_a == "code") {
-          if (obj.code_block.syntax.length > 0)
+          if (obj.code_block.syntax.length > 0) {
             output ~= ".code_syntax: " ~ obj.code_block.syntax;
-          if (obj.code_block.linenumbers)
+          }
+          if (obj.code_block.linenumbers) {
             output ~= ".code_linenumbers: true";
+          }
         }
         /+ ↓ stow (extracted links) +/
         if (obj.stow.link.length > 0) {
           foreach (lnk; obj.stow.link) {
-            if (lnk.length > 0)
+            if (lnk.length > 0) {
               output ~= ".stow_link: " ~ lnk;
+            }
           }
         }
         /+ ↓ tag properties +/
-        if (obj.tags.in_segment_html.length > 0)
+        if (obj.tags.in_segment_html.length > 0) {
           output ~= ".segment: " ~ obj.tags.in_segment_html;
+        }
         if (obj.tags.anchor_tag_html.length > 0
-          && obj.tags.anchor_tag_html != obj.tags.in_segment_html)
+          && obj.tags.anchor_tag_html != obj.tags.in_segment_html) {
           output ~= ".anchor: " ~ obj.tags.anchor_tag_html;
-        if (obj.tags.segname_prev.length > 0)
+        }
+        if (obj.tags.segname_prev.length > 0) {
           output ~= ".segment_prev: " ~ obj.tags.segname_prev;
-        if (obj.tags.segname_next.length > 0)
+        }
+        if (obj.tags.segname_next.length > 0) {
           output ~= ".segment_next: " ~ obj.tags.segname_next;
-        if (obj.tags.heading_lev_anchor_tag.length > 0)
+        }
+        if (obj.tags.heading_lev_anchor_tag.length > 0) {
           output ~= ".heading_lev_anchor: " ~ obj.tags.heading_lev_anchor_tag;
-        if (obj.tags.segment_anchor_tag_epub.length > 0)
+        }
+        if (obj.tags.segment_anchor_tag_epub.length > 0) {
           output ~= ".segment_epub: " ~ obj.tags.segment_anchor_tag_epub;
+        }
         /+ ↓ heading ancestors text +/
         {
           bool has_hat = false;
@@ -384,15 +457,17 @@ template spineAbstractionTxt() {
         /+ ↓ lev4 subtoc +/
         if (obj.tags.lev4_subtoc.length > 0) {
           foreach (st; obj.tags.lev4_subtoc) {
-            if (st.length > 0)
+            if (st.length > 0) {
               output ~= ".lev4_subtoc: " ~ st;
+            }
           }
         }
         /+ ↓ anchor tags +/
         if (obj.tags.anchor_tags.length > 0) {
           foreach (at; obj.tags.anchor_tags) {
-            if (at.length > 0)
+            if (at.length > 0) {
               output ~= ".anchor_tag: " ~ at;
+            }
           }
         }
         /+ ↓ text content +/
diff --git a/src/sisudoc/ocda/meta/metadoc_from_src.d b/src/sisudoc/ocda/meta/metadoc_from_src.d
index dec00c6..229bff1 100644
--- a/src/sisudoc/ocda/meta/metadoc_from_src.d
+++ b/src/sisudoc/ocda/meta/metadoc_from_src.d
@@ -763,7 +763,7 @@ template docAbstraction() {
                 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.identifier                   = obj_cite_digits.identifier;
-                comp_obj_.metainfo.object_number_off            = (obj_cite_digits.off == 0)   ? true : false; // TODO
+                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_.attrib.indent_hang                    = indent["hang_position"];