/usr/share/doc/mkvtoolnix/examples/matroskachapters.dtd is in mkvtoolnix 19.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | <!ELEMENT Chapters (EditionEntry*)>
<!ELEMENT EditionEntry (
EditionUID,
EditionFlagHidden?,
EditionManaged?,
EditionFlagDefault?,
ChapterAtom*)>
<!ELEMENT EditionUID (#PCDATA)>
<!ELEMENT EditionFlagHidden (#PCDATA)>
<!ELEMENT EditionManaged (#PCDATA)>
<!ELEMENT EditionFlagDefault (#PCDATA)>
<!ELEMENT ChapterAtom (
ChapterTimeStart,
ChapterTimeEnd?,
ChapterUID?,
ChapterSegmentUID?,
ChapterSegmentEditionUID?,
ChapterPhysicalEquiv?,
ChapterTrack?,
ChapterFlagHidden?,
ChapterFlagEnabled?,
ChapterDisplay*,
ChapterProcess*,
ChapterAtom*)>
<!ELEMENT ChapterTrack (ChapterTrackNumber)>
<!ELEMENT ChapterTrackNumber (#PCDATA)>
<!ELEMENT ChapterDisplay (
ChapterString,
ChapterLanguage+,
ChapterCountry*)>
<!ELEMENT ChapterProcess (
ChapterProcessCodecID,
ChapterProcessPrivate?,
ChapterProcessCommand+)>
<!ELEMENT ChapterProcessCommand (
ChapterProcessTime,
ChapterProcessData)>
<!ELEMENT ChapterTimeStart (#PCDATA)>
<!ELEMENT ChapterTimeEnd (#PCDATA)>
<!ELEMENT ChapterFlagHidden (#PCDATA)>
<!ELEMENT ChapterFlagEnabled (#PCDATA)>
<!ELEMENT ChapterUID (#PCDATA)>
<!ELEMENT ChapterSegmentUID (#PCDATA)>
<!ELEMENT ChapterSegmentEditionUID (#PCDATA)>
<!ELEMENT ChapterPhysicalEquiv (#PCDATA)>
<!ELEMENT ChapterProcessCodecID (#PCDATA)>
<!ELEMENT ChapterProcessPrivate (#PCDATA)>
<!ELEMENT ChapterProcessTime (#PCDATA)>
<!ELEMENT ChapterProcessData (#PCDATA)>
<!ELEMENT ChapterString (#PCDATA)>
<!ELEMENT ChapterLanguage (#PCDATA)>
<!ELEMENT ChapterCountry (#PCDATA)>
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