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e1286924ff
Section page number styles 0x4C1A SingleLeadingZeros, 0x4C13 DoubleLeadingZeros, 0x4C19 LowerLetters and 0x4C16 UpperRoman, from pairs that had warned about them (89 sections with an IDML section, no contradiction). Pages of these sections get names in that style; in the page Descriptor of a SingleLeadingZeros section IDML writes the section prefix as a string in place of the style (1,249 of 1,249 descriptors). An index topic record ends with a u32 count of cross references, their UIDs and a u32, not with 8 fixed bytes. 29 pairs whose topic has one cross reference lost the whole index section with a warning; their topics are now written. CrossReference elements are not written yet. Also documents the colour model code 3 (mixed inks, written by IDML as MixedInk elements) and the 104-byte object style frame settings of InDesign 4.0 to 6.0 (no pair), which stay unconverted. compare.py --exclude own/, trustworthy pairs: +727 values before the descriptor rule (Section PageNumberStyle 1,257 -> 1,344 of 1,344, Page Name 645 -> 553 wrong, 29 Topic elements), 0 lost on any key; with the rule, the page descriptors of the subsets checked are all reproduced.
4.7 KiB
Index
The index of a document: the index object, its sections and topics, and the page references in the text. Little-endian files; no big-endian sample has an index. A "u32 string" is a u32 length in UTF-16 units, then text segments.
Index object (class 0x13004)
A document with an index has one object of class 0x13004. IDML writes
an Index element in designmap.xml with Self u and the UID in
hexadecimal, after the CrossReferenceFormat elements and before
idPkg:BackingStory. Evidence: 17 of 17 pairs with an index (16
trustworthy); no other pair has either.
Chunk 0x13005: u16 0, u16 n, n UIDs of section objects (class
0x13005), u16 0. n is 27 in most pairs and 60 in a pair with a
Cyrillic group. Chunk 0x1300E holds the index's own copy of the header
groups; IDML takes the header list from the preferences
(preferences.md, index header setting).
Sections (class 0x13005) and topics
Chunk 0x13006 of a section is a u32, the index UID. Chunk 0x13007 holds the section's topics; sections without topics do not have it:
| Field | Contents |
|---|---|
| u32 | Number of level-1 topics |
| u16 | 0 |
| u32 | Number of topic records that follow (all levels) |
| records | Depth first: each topic is followed by its subtopics |
Topic record:
| Field | Contents | IDML Topic |
|---|---|---|
| u8, u8 | 0, 1 | |
| u16 | Level: 1 for a top topic, 2 for its subtopic, … | nesting |
| u32 | Number of direct subtopics | |
| u32 string | Topic text | Name |
| u32 string | Sort order (empty in every sample) | SortOrder |
| u32 m, m UIDs | The page references (class 0x13006) of this topic | their ReferencedTopic |
| u32 k, k UIDs | The topic's cross references (class 0x13007), below | CrossReference children |
| u32 | 0 in every sample |
- IDML writes the topics as
Topicchildren ofIndex, a subtopic as a child of its topic: sections in the order of chunk 0x13005, records in stored order. Selfis the parent'sSelf,Topicnand the topic text, so a level-2 topic hasu<index>Topicn<parent text>Topicn<own text>.- Evidence: every chunk of the pairs is read to its end. The topics
(
Self,Name,SortOrder, nesting) equal the IDML in 2,185 of 2,185 IDML topics of the trustworthy pairs (2,223 in all pairs). In one trustworthy pair the INDD has 3 more topics, and 3 more page references, than its IDML (below).
Cross references. In the corpus after 2026-10, 29 pairs (InDesign
13.0 and 13.1, from one set of tutorial files) have a topic with k = 1.
Read with a fixed 8 bytes after the page references, these sections
ended 4 bytes early and were left out. The UID is that of the topic's
IDML CrossReference (Self="u…"). The cross reference object has
chunk 0x1300B (u16 4 for CrossReferenceType="SeeAlsoHerein", u32 UID
of a class 0x13008 object, u32 0) and chunk 0x13008 (u16 2, u32 the
section). The class 0x13008 object (chunk 0x1300C) holds the UID of
the section of the referenced topic, the topic's position in it (1) and
the cross reference's UID. Every topic of the pairs before 2026-10 has
k = 0. The converter reads the list so that the section's topics are
written; it does not write CrossReference elements, as one sample
shows one type code.
Page references (class 0x13006)
A page reference is owned by a U+FEFF in the story text (owned items,
objects.md). IDML writes a PageReference in place of the character.
| Chunk | Contents |
|---|---|
| 0x13053 | u32: the owned-items strand that holds the marker |
| 0x13008 | u16 1, u32 the section that holds the topic |
| 0x13009 | 30 bytes (26 in InDesign 8.0): below |
Chunk 0x13009:
| Offset | Contents | IDML |
|---|---|---|
| 0–13 | u32 1, u16 0, u32 1, u32 0 in every sample | PageReferenceType="CurrentPage" (every IDML page reference) |
| 14, 18 | two equal u32 (0 to 8, or 0xFFFFFFFF) | not written |
| 22 | u32 (1 or 9) | not written |
| 26 | u32, only in a 30-byte chunk | Id |
Selfisuand the UID in hexadecimal.ReferencedTopicis theSelfof the topic whose record lists the page reference.- The 3 page references of the one InDesign 8.0 pair have the 26-byte
chunk, and their IDML has no
Id.
Evidence: all four attributes equal the IDML for 7,523 of 7,523 page
references of the trustworthy pairs (7,561 in all pairs; Id for 7,520
and 7,558, the others have the 26-byte chunk). The converter writes
PageReferenceType only when the first 14 bytes are those of the
samples.
Topics missing from the IDML
In one trustworthy pair (DOM 14) the INDD has 3 topics and 3 page
references that its IDML lacks; the IDML text also lacks their 3
U+FEFF characters. Their Ids are the 3 highest of the document. The
IDML was most likely exported before these entries were made. The
converter writes them.