From df6c766f5ebe75a37b97705487516e26795df982 Mon Sep 17 00:00:00 2001
From: Panos Vagenas <pva@zurich.ibm.com>
Date: Tue, 1 Sep 2026 16:08:12 +0200
Subject: [PATCH 1/5] add `<track>` for time-aligned media transcripts
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- New `<track>` semantic element: `<bdiv/>`-delimited cue blocks, each with a mandatory start
  time and optional end time, an optional `<frame>` and `<audio>`, and a transcript of
  `<voice>`-attributed turns
- Semantics: cue blocks cover inclusive `[start, end]` intervals (missing end means
  `[start, start]`) and are ordered by non-decreasing start time, overlaps allowed
- Validation: XSD elements/groups + `top_level_cat` entry + range facets; Schematron rules for
  cue-block structure, timestamp order, and block sequence
- Archive: whole-track media in `audio/` and `video/` (`{N}.{ext}` by `<track>` position);
  `pack()` and `doclang pack` gain `--audio`/`--video`; media content types added; archive-demo
  gains a track and a spoken `audio/1.wav`
- Docs/tests: spec `### Tracks` section, regenerated `### Reference` (drops the abandoned
  `<timestamp>`/`<hour>`/… draft rows), token vocab, and track + packaging fixtures

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
---
 doclang/_packaging.py                         |  92 +++++-
 doclang/cli.py                                |  50 ++-
 doclang/doclang.sch                           | 126 +++++++-
 doclang/doclang.xsd                           | 108 ++++++-
 doclang/packaging.py                          |  15 +-
 doclang/tokenization.py                       |  42 ++-
 examples/archive-demo/audio/1.wav             | Bin 0 -> 99048 bytes
 examples/archive-demo/document.xml            |  16 +
 reference/input/examples/track.dclg           |  16 +
 reference/input/reference.xlsx                | Bin 15917 -> 16466 bytes
 spec.md                                       | 302 +++++++++++++++++-
 .../data/invalid/nok_bdiv_invalid_scope.dclg  |   4 +
 .../nok_track_blocks_out_of_order.dclg        |  12 +
 ...nok_track_cue_block_missing_timestamp.dclg |   8 +
 .../invalid/nok_track_end_before_start.dclg   |  10 +
 .../nok_track_frame_before_timestamp.dclg     |   9 +
 .../nok_track_frame_src_after_body.dclg       |   9 +
 .../data/invalid/nok_track_frame_two_src.dclg |   9 +
 .../nok_track_minutes_out_of_range.dclg       |   8 +
 .../invalid/nok_track_missing_seconds.dclg    |   9 +
 .../invalid/nok_track_msecs_out_of_range.dclg |   8 +
 tests/data/invalid/nok_track_no_bdiv.dclg     |   8 +
 .../nok_track_text_before_timestamp.dclg      |   9 +
 .../invalid/nok_track_third_timestamp.dclg    |  10 +
 tests/data/valid/ok_track_element_head.dclg   |  21 ++
 tests/data/valid/ok_track_frame_audio.dclg    |  12 +
 tests/data/valid/ok_track_frame_point.dclg    |   9 +
 .../valid/ok_track_in_group_and_cell.dclg     |  20 ++
 .../valid/ok_track_inline_formatting.dclg     |   9 +
 tests/data/valid/ok_track_minimal.dclg        |   9 +
 .../valid/ok_track_overlapping_blocks.dclg    |  16 +
 tests/data/valid/ok_track_start_end_runs.dclg |  10 +
 .../data/valid/ok_track_tied_start_times.dclg |  16 +
 tests/data/valid/ok_track_voices.dclg         |  16 +
 tests/test_packaging.py                       |  81 +++++
 tests/test_tokenization.py                    |  23 +-
 36 files changed, 1098 insertions(+), 24 deletions(-)
 create mode 100644 examples/archive-demo/audio/1.wav
 create mode 100644 reference/input/examples/track.dclg
 create mode 100644 tests/data/invalid/nok_bdiv_invalid_scope.dclg
 create mode 100644 tests/data/invalid/nok_track_blocks_out_of_order.dclg
 create mode 100644 tests/data/invalid/nok_track_cue_block_missing_timestamp.dclg
 create mode 100644 tests/data/invalid/nok_track_end_before_start.dclg
 create mode 100644 tests/data/invalid/nok_track_frame_before_timestamp.dclg
 create mode 100644 tests/data/invalid/nok_track_frame_src_after_body.dclg
 create mode 100644 tests/data/invalid/nok_track_frame_two_src.dclg
 create mode 100644 tests/data/invalid/nok_track_minutes_out_of_range.dclg
 create mode 100644 tests/data/invalid/nok_track_missing_seconds.dclg
 create mode 100644 tests/data/invalid/nok_track_msecs_out_of_range.dclg
 create mode 100644 tests/data/invalid/nok_track_no_bdiv.dclg
 create mode 100644 tests/data/invalid/nok_track_text_before_timestamp.dclg
 create mode 100644 tests/data/invalid/nok_track_third_timestamp.dclg
 create mode 100644 tests/data/valid/ok_track_element_head.dclg
 create mode 100644 tests/data/valid/ok_track_frame_audio.dclg
 create mode 100644 tests/data/valid/ok_track_frame_point.dclg
 create mode 100644 tests/data/valid/ok_track_in_group_and_cell.dclg
 create mode 100644 tests/data/valid/ok_track_inline_formatting.dclg
 create mode 100644 tests/data/valid/ok_track_minimal.dclg
 create mode 100644 tests/data/valid/ok_track_overlapping_blocks.dclg
 create mode 100644 tests/data/valid/ok_track_start_end_runs.dclg
 create mode 100644 tests/data/valid/ok_track_tied_start_times.dclg
 create mode 100644 tests/data/valid/ok_track_voices.dclg

diff --git a/doclang/_packaging.py b/doclang/_packaging.py
index 0dbf10e..b917366 100644
--- a/doclang/_packaging.py
+++ b/doclang/_packaging.py
@@ -17,6 +17,17 @@
   <Default Extension="jpg" ContentType="image/jpeg"/>
   <Default Extension="jpeg" ContentType="image/jpeg"/>
   <Default Extension="webp" ContentType="image/webp"/>
+  <Default Extension="mp3" ContentType="audio/mpeg"/>
+  <Default Extension="m4a" ContentType="audio/mp4"/>
+  <Default Extension="aac" ContentType="audio/aac"/>
+  <Default Extension="ogg" ContentType="audio/ogg"/>
+  <Default Extension="opus" ContentType="audio/ogg"/>
+  <Default Extension="wav" ContentType="audio/wav"/>
+  <Default Extension="flac" ContentType="audio/flac"/>
+  <Default Extension="mp4" ContentType="video/mp4"/>
+  <Default Extension="webm" ContentType="video/webm"/>
+  <Default Extension="mkv" ContentType="video/x-matroska"/>
+  <Default Extension="mov" ContentType="video/quicktime"/>
   <Override PartName="/document.xml" ContentType="application/vnd.doclang.document+xml"/>
 </Types>
 """
@@ -37,6 +48,9 @@
     Mapping[int, Union[str, Path]],
 ]
 
+# Whole-track media (audio/, video/) uses the same 1-based positional model as pages/.
+MediaInput = PagesInput
+
 AssetsInput = Union[
     str,
     Path,
@@ -96,25 +110,71 @@ def _place_document(stage: Path, document: Path) -> None:
     shutil.copy2(document, stage / "document.xml")
 
 
-def _place_pages(stage: Path, pages: PagesInput) -> None:
-    pages_dir = stage / "pages"
-    if isinstance(pages, Mapping):
-        for page_number, source in pages.items():
-            if not isinstance(page_number, int) or page_number < 1:
-                raise PackagingError(f"Page numbers must be positive integers, got {page_number!r}")
+def _place_indexed(
+    stage: Path,
+    spec: PagesInput,
+    *,
+    subdir: str,
+    file_label: str,
+    dir_label: str,
+    number_label: str,
+) -> None:
+    """Place 1-based positionally-indexed files (``{N}.{ext}``) under ``stage/subdir``.
+
+    Shared by ``pages/`` (page images) and ``audio/`` / ``video/`` (whole-track media),
+    which all key a file to an integer position in the document.
+    """
+    target_dir = stage / subdir
+    if isinstance(spec, Mapping):
+        for number, source in spec.items():
+            if not isinstance(number, int) or number < 1:
+                raise PackagingError(f"{number_label} must be positive integers, got {number!r}")
             source_path = Path(source)
-            destination = pages_dir / f"{page_number}{source_path.suffix}"
-            _copy_file(source_path, destination, label="Page file")
+            destination = target_dir / f"{number}{source_path.suffix}"
+            _copy_file(source_path, destination, label=file_label)
         return
 
-    if isinstance(pages, str | Path):
-        _copy_tree_into(Path(pages), pages_dir, label="Pages directory")
+    if isinstance(spec, str | Path):
+        _copy_tree_into(Path(spec), target_dir, label=dir_label)
         return
 
-    for index, source in enumerate(pages, start=1):
+    for index, source in enumerate(spec, start=1):
         source_path = Path(source)
-        destination = pages_dir / f"{index}{source_path.suffix}"
-        _copy_file(source_path, destination, label="Page file")
+        destination = target_dir / f"{index}{source_path.suffix}"
+        _copy_file(source_path, destination, label=file_label)
+
+
+def _place_pages(stage: Path, pages: PagesInput) -> None:
+    _place_indexed(
+        stage,
+        pages,
+        subdir="pages",
+        file_label="Page file",
+        dir_label="Pages directory",
+        number_label="Page numbers",
+    )
+
+
+def _place_audio(stage: Path, audio: MediaInput) -> None:
+    _place_indexed(
+        stage,
+        audio,
+        subdir="audio",
+        file_label="Audio file",
+        dir_label="Audio directory",
+        number_label="Audio track numbers",
+    )
+
+
+def _place_video(stage: Path, video: MediaInput) -> None:
+    _place_indexed(
+        stage,
+        video,
+        subdir="video",
+        file_label="Video file",
+        dir_label="Video directory",
+        number_label="Video track numbers",
+    )
 
 
 def _place_assets(stage: Path, assets: AssetsInput) -> None:
@@ -164,6 +224,8 @@ def _pack(
     output: Union[str, Path, None] = None,
     pages: PagesInput | None = None,
     assets: AssetsInput | None = None,
+    audio: MediaInput | None = None,
+    video: MediaInput | None = None,
     validate: bool = False,
 ) -> Path:
     document_path = Path(document)
@@ -176,6 +238,10 @@ def _pack(
             _place_pages(stage, pages)
         if assets is not None:
             _place_assets(stage, assets)
+        if audio is not None:
+            _place_audio(stage, audio)
+        if video is not None:
+            _place_video(stage, video)
         _write_opc_metadata(stage)
 
         if validate:
diff --git a/doclang/cli.py b/doclang/cli.py
index 0db1f5f..32fced7 100644
--- a/doclang/cli.py
+++ b/doclang/cli.py
@@ -200,6 +200,38 @@ def pack(
         file_okay=False,
         dir_okay=True,
     ),
+    audio_dir: Path | None = typer.Option(
+        None,
+        "--audio-dir",
+        help="Directory of whole-track audio files (2.mp3, 4.ogg, …)",
+        exists=True,
+        file_okay=False,
+        dir_okay=True,
+    ),
+    audio_files: list[Path] | None = typer.Option(
+        None,
+        "--audio",
+        help="Whole-track audio file; repeat to add tracks in order (renumbered as 1.ext, 2.ext, …)",
+        exists=True,
+        file_okay=True,
+        dir_okay=False,
+    ),
+    video_dir: Path | None = typer.Option(
+        None,
+        "--video-dir",
+        help="Directory of whole-track video files (3.mp4, 4.mkv, …)",
+        exists=True,
+        file_okay=False,
+        dir_okay=True,
+    ),
+    video_files: list[Path] | None = typer.Option(
+        None,
+        "--video",
+        help="Whole-track video file; repeat to add tracks in order (renumbered as 1.ext, 2.ext, …)",
+        exists=True,
+        file_okay=True,
+        dir_okay=False,
+    ),
     validate_before_pack: bool = typer.Option(False, "--validate", help="Validate document before packing"),
     quiet: bool = typer.Option(False, "--quiet", "-q", help="Quiet mode (exit code only)"),
 ):
@@ -207,8 +239,10 @@ def pack(
     Pack a DocLang markup file and optional media into a .dclx archive.
 
     DOCUMENT is copied to document.xml. Optional page images (--pages, --page)
-    are placed under pages/. Optional payload files (--assets, --asset) are
-    placed under assets/ for URIs referenced in the markup. OPC metadata
+    are placed under pages/. Optional whole-track audio/video (--audio-dir,
+    --audio, --video-dir, --video) are placed under audio/ and video/ as
+    {N}.{ext} for the Nth <track>. Optional payload files (--assets, --asset)
+    are placed under assets/ for URIs referenced in the markup. OPC metadata
     ([Content_Types].xml, _rels/.rels) is generated automatically.
 
     By default, writes <document>.dclx next to the input file.
@@ -219,6 +253,7 @@ def pack(
         doclang pack markup.dclg -o report.dclx --pages screenshots/
         doclang pack markup.dclg --page a.png --page b.png
         doclang pack markup.dclg --asset chart.svg=exports/diagram.svg
+        doclang pack markup.dclg --audio-dir recordings/ --video-dir recordings/
         doclang pack markup.dclg --assets payload/ --validate
     """
     if pages_dir is not None and page_files:
@@ -227,6 +262,12 @@ def pack(
     if assets_dir is not None and asset_mappings:
         typer.echo("Error: --assets and --asset are mutually exclusive", err=True)
         raise typer.Exit(1)
+    if audio_dir is not None and audio_files:
+        typer.echo("Error: --audio-dir and --audio are mutually exclusive", err=True)
+        raise typer.Exit(1)
+    if video_dir is not None and video_files:
+        typer.echo("Error: --video-dir and --video are mutually exclusive", err=True)
+        raise typer.Exit(1)
 
     output_path = output or document.with_suffix(".dclx")
 
@@ -246,12 +287,17 @@ def pack(
     else:
         assets = None
 
+    audio: Path | list[Path] | None = audio_dir if audio_dir is not None else (audio_files or None)
+    video: Path | list[Path] | None = video_dir if video_dir is not None else (video_files or None)
+
     try:
         created = pack_document(
             document,
             output=output_path,
             pages=pages,
             assets=assets,
+            audio=audio,
+            video=video,
             validate=validate_before_pack,
         )
     except ValidationError as exc:
diff --git a/doclang/doclang.sch b/doclang/doclang.sch
index 222b704..fc59659 100644
--- a/doclang/doclang.sch
+++ b/doclang/doclang.sch
@@ -27,6 +27,27 @@
     </sch:rule>
   </sch:pattern>
 
+  <!-- ============================================ -->
+  <!-- TRACK: Must start with bdiv (after optional element head) -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-structure">
+    <sch:rule context="dl:track[*]">
+      <sch:let name="first-non-header" value="*[not(self::dl:label or self::dl:thread or self::dl:xref or self::dl:href or self::dl:layer or self::dl:location or self::dl:caption or self::dl:description or self::dl:summary or self::dl:custom)][1]"/>
+      <sch:let name="text-before-first-bdiv" value="text()[following-sibling::dl:bdiv and not(preceding-sibling::dl:bdiv)][normalize-space(.) != '']"/>
+
+      <sch:assert test="not($first-non-header) or $first-non-header[self::dl:bdiv]">
+        Track must have bdiv as first element after optional element head (property elements: label, thread, xref, href, layer, location, caption, description, summary, custom).
+        Found: <sch:value-of select="if ($first-non-header) then name($first-non-header) else 'nothing'"/>
+      </sch:assert>
+
+      <sch:assert test="empty($text-before-first-bdiv)">
+        Track must not contain non-whitespace text before its first cue block (bdiv).
+        Found: '<sch:value-of select="normalize-space(string-join($text-before-first-bdiv, ''))"/>'
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
   <!-- ============================================ -->
   <!-- TABLE: Must start with cell token (after optional element head) -->
   <!-- ============================================ -->
@@ -80,7 +101,7 @@
     <sch:rule context="dl:text | dl:heading | dl:code | dl:formula | dl:caption | dl:description | dl:summary |
                        dl:page_header | dl:page_footer | dl:footnote | dl:picture | dl:marker |
                        dl:field_region | dl:field_heading | dl:field_item | dl:key | dl:value |
-                       dl:list | dl:table | dl:index | dl:group">
+                       dl:list | dl:table | dl:index | dl:group | dl:track | dl:voice | dl:frame | dl:audio">
       <sch:let name="header-elements" value="dl:label | dl:thread | dl:xref | dl:href | dl:layer | dl:location | dl:caption | dl:description | dl:summary | dl:custom"/>
 
       <sch:let name="text-before-header" value="text()[following-sibling::*[self::dl:label or self::dl:thread or self::dl:xref or self::dl:href or self::dl:layer or self::dl:location or self::dl:caption or self::dl:description or self::dl:summary or self::dl:custom]]"/>
@@ -355,4 +376,107 @@
     </sch:rule>
   </sch:pattern>
 
+  <!-- ============================================ -->
+  <!-- TRACK CUE BLOCK: must open with a start timestamp; no text before it -->
+  <!-- The cue block is the run of siblings after a <bdiv/> up to the next <bdiv/> -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-cue-block">
+    <sch:rule context="dl:track/dl:bdiv">
+      <sch:let name="next-bdiv" value="following-sibling::dl:bdiv[1]"/>
+      <sch:let name="cue-content" value="if ($next-bdiv)
+                                         then following-sibling::node()[following-sibling::dl:bdiv[1] is $next-bdiv]
+                                         else following-sibling::node()"/>
+      <sch:let name="first-elem" value="$cue-content[self::*][1]"/>
+      <sch:let name="first-elem-index" value="if ($first-elem)
+                                              then index-of($cue-content, $first-elem)[1]
+                                              else 0"/>
+      <sch:let name="text-before-first-elem" value="if ($first-elem-index > 0)
+                                                    then for $i in 1 to ($first-elem-index - 1)
+                                                         return $cue-content[$i][self::text()][normalize-space(.) != '']
+                                                    else $cue-content[self::text()][normalize-space(.) != '']"/>
+
+      <sch:assert test="not($first-elem) or $first-elem[self::dl:hours or self::dl:minutes]">
+        A track cue block must begin with a start timestamp: its first element must be hours or minutes.
+        Found: <sch:value-of select="if ($first-elem) then name($first-elem) else 'nothing'"/>
+      </sch:assert>
+
+      <sch:assert test="empty($text-before-first-elem)">
+        A track cue block must not contain non-whitespace text before its start timestamp.
+        Found: '<sch:value-of select="normalize-space(string-join($text-before-first-elem, ''))"/>'
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
+  <!-- ============================================ -->
+  <!-- TRACK CUE BLOCK: end timestamp must not precede the start timestamp -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-cue-block-timestamp-order">
+    <sch:rule context="dl:track/dl:bdiv">
+      <sch:let name="next-bdiv" value="following-sibling::dl:bdiv[1]"/>
+      <sch:let name="cue" value="if ($next-bdiv)
+                                 then following-sibling::*[following-sibling::dl:bdiv[1] is $next-bdiv]
+                                 else following-sibling::*"/>
+      <sch:let name="mins" value="$cue[self::dl:minutes]"/>
+
+      <sch:let name="m1" value="$mins[1]"/>
+      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
+                                      + 60000 * number($m1/@value)
+                                      + 1000 * number($s1/@value)
+                                      + (if ($ms1) then number($ms1/@value) else 0)"/>
+
+      <sch:let name="m2" value="$mins[2]"/>
+      <sch:let name="h2" value="$m2/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="s2" value="$m2/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ms2" value="$s2/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="end-ms" value="3600000 * (if ($h2) then number($h2/@value) else 0)
+                                    + 60000 * number($m2/@value)
+                                    + 1000 * number($s2/@value)
+                                    + (if ($ms2) then number($ms2/@value) else 0)"/>
+
+      <sch:assert test="count($mins) != 2 or $end-ms ge $start-ms">
+        A track cue block end timestamp must not be earlier than its start timestamp.
+        Found start=<sch:value-of select="$start-ms"/>ms, end=<sch:value-of select="$end-ms"/>ms.
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
+  <!-- ============================================ -->
+  <!-- TRACK CUE BLOCK: cue blocks appear in non-decreasing order of start time -->
+  <!-- (blocks may still overlap, e.g. simultaneous speakers) -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-cue-block-sequence">
+    <sch:rule context="dl:track/dl:bdiv[preceding-sibling::dl:bdiv]">
+      <sch:let name="prev-bdiv" value="preceding-sibling::dl:bdiv[1]"/>
+
+      <sch:let name="m1" value="following-sibling::dl:minutes[1]"/>
+      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
+                                      + 60000 * number($m1/@value)
+                                      + 1000 * number($s1/@value)
+                                      + (if ($ms1) then number($ms1/@value) else 0)"/>
+
+      <sch:let name="pm1" value="$prev-bdiv/following-sibling::dl:minutes[1]"/>
+      <sch:let name="ph1" value="$pm1/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="ps1" value="$pm1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="pms1" value="$ps1/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="prev-start-ms" value="3600000 * (if ($ph1) then number($ph1/@value) else 0)
+                                           + 60000 * number($pm1/@value)
+                                           + 1000 * number($ps1/@value)
+                                           + (if ($pms1) then number($pms1/@value) else 0)"/>
+
+      <sch:assert test="$start-ms ge $prev-start-ms">
+        Track cue blocks must appear in non-decreasing order of start time.
+        Found this cue block start=<sch:value-of select="$start-ms"/>ms, previous cue block start=<sch:value-of select="$prev-start-ms"/>ms.
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
 </sch:schema>
diff --git a/doclang/doclang.xsd b/doclang/doclang.xsd
index 6839cce..7aad29a 100644
--- a/doclang/doclang.xsd
+++ b/doclang/doclang.xsd
@@ -455,7 +455,7 @@
 
   <!-- ============================================ -->
   <!-- TOP_LEVEL_CAT: reusable group for top-level document elements -->
-  <!-- Includes: text, heading, code, formula, page_header, page_footer, footnote, list, field_region, field_heading, field_item, key, value, picture, table, index, group -->
+  <!-- Includes: text, heading, code, formula, page_header, page_footer, footnote, list, field_region, field_heading, field_item, key, value, picture, table, index, group, track -->
   <!-- Note: caption, description, and summary appear only in the element head (element_head), not in body content -->
   <!-- ============================================ -->
 
@@ -478,6 +478,7 @@
       <xs:element ref="dl:picture"/>
       <xs:element ref="dl:table"/>
       <xs:element ref="dl:index"/>
+      <xs:element ref="dl:track"/>
     </xs:choice>
   </xs:group>
 
@@ -693,6 +694,111 @@
     </xs:complexType>
   </xs:element>
 
+  <!-- ============================================ -->
+  <!-- TRACK: time-aligned media transcript -->
+  <!-- element_head + sequence of cue blocks; each cue block is delimited by <bdiv/> -->
+  <!-- (parallel to <ldiv/> for lists) and carries: a mandatory start timestamp, an -->
+  <!-- optional end timestamp, an optional <frame>, an optional <audio>, then an -->
+  <!-- optional transcript of <voice>-attributed turns and inline-formatted text. -->
+  <!-- ============================================ -->
+
+  <!-- Timestamp component value ranges -->
+  <xs:simpleType name="minsec_value">
+    <xs:restriction base="xs:integer">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="59"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="msec_value">
+    <xs:restriction base="xs:integer">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="999"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- Timestamp component elements (empty, value required) -->
+  <xs:element name="hours">
+    <xs:complexType>
+      <xs:attribute name="value" type="xs:nonNegativeInteger" use="required"/>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="minutes">
+    <xs:complexType>
+      <xs:attribute name="value" type="dl:minsec_value" use="required"/>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="seconds">
+    <xs:complexType>
+      <xs:attribute name="value" type="dl:minsec_value" use="required"/>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="msecs">
+    <xs:complexType>
+      <xs:attribute name="value" type="dl:msec_value" use="required"/>
+    </xs:complexType>
+  </xs:element>
+
+  <!-- Timestamp run: hours? minutes seconds msecs? (hours/msecs default to 0 when omitted) -->
+  <xs:group name="timestamp">
+    <xs:sequence>
+      <xs:element ref="dl:hours" minOccurs="0"/>
+      <xs:element ref="dl:minutes"/>
+      <xs:element ref="dl:seconds"/>
+      <xs:element ref="dl:msecs" minOccurs="0"/>
+    </xs:sequence>
+  </xs:group>
+
+  <!-- BDIV ELEMENT: cue-block delimiter (parallel to ldiv) -->
+  <xs:element name="bdiv"><xs:complexType/></xs:element>
+
+  <!-- FRAME / AUDIO: picture_type minus <tabular> and minus @class -->
+  <xs:complexType name="media_capture_type" mixed="true">
+    <xs:sequence>
+      <xs:group ref="dl:element_head"/>
+      <xs:element ref="dl:src" minOccurs="0"/>
+      <xs:group ref="dl:virtual_text_content" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+  </xs:complexType>
+  <xs:element name="frame" type="dl:media_capture_type"/>
+  <xs:element name="audio" type="dl:media_capture_type"/>
+
+  <!-- VOICE ELEMENT: speaker attribution; same content model as <text> -->
+  <xs:element name="voice" type="dl:component_with_semantic_seq"/>
+
+  <!-- Transcript region: <voice>-attributed turns plus inline-formatted / raw text -->
+  <xs:group name="transcript_content">
+    <xs:choice>
+      <xs:element ref="dl:content"/>
+      <xs:element ref="dl:voice"/>
+      <xs:group ref="dl:headless_txt"/>
+    </xs:choice>
+  </xs:group>
+
+  <!-- TRACK_CUE_BLOCK: bdiv + start timestamp + optional end timestamp + optional frame/audio + optional transcript -->
+  <xs:group name="track_cue_block">
+    <xs:sequence>
+      <xs:element ref="dl:bdiv"/>
+      <xs:group ref="dl:timestamp"/>
+      <xs:group ref="dl:timestamp" minOccurs="0"/>
+      <xs:element ref="dl:frame" minOccurs="0"/>
+      <xs:element ref="dl:audio" minOccurs="0"/>
+      <xs:group ref="dl:transcript_content" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+  </xs:group>
+
+  <!-- TRACK ELEMENT: optional element_head + track_cue_block* -->
+  <!-- Semantic element: may optionally begin with element_head (per spec.md) -->
+  <!-- mixed: a literal newline between consecutive unattributed transcript turns is allowed -->
+  <!-- Schematron enforces: must start with bdiv (after optional track-level element head) -->
+  <xs:element name="track">
+    <xs:complexType mixed="true">
+      <xs:sequence>
+        <xs:group ref="dl:element_head"/>
+        <xs:group ref="dl:track_cue_block" minOccurs="0" maxOccurs="unbounded"/>
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+
   <!-- ============================================ -->
   <!-- ROOT DOCLANG: sequence of top_level_cat -->
   <!-- ============================================ -->
diff --git a/doclang/packaging.py b/doclang/packaging.py
index c6f73b6..fa1f468 100644
--- a/doclang/packaging.py
+++ b/doclang/packaging.py
@@ -17,6 +17,8 @@ def pack(
     output: Union[str, Path, None] = None,
     pages: (Union[str, Path] | Sequence[Union[str, Path]] | Mapping[int, Union[str, Path]] | None) = None,
     assets: (Union[str, Path] | Mapping[str, Union[str, Path]] | None) = None,
+    audio: (Union[str, Path] | Sequence[Union[str, Path]] | Mapping[int, Union[str, Path]] | None) = None,
+    video: (Union[str, Path] | Sequence[Union[str, Path]] | Mapping[int, Union[str, Path]] | None) = None,
     validate: bool = False,
 ) -> Path:
     """Pack a DocLang markup file and optional media into a ``.dclx`` OPC archive.
@@ -31,11 +33,18 @@ def pack(
     paths (renumbered as ``1.ext``, ``2.ext``, …), or a mapping of page number
     to image path.
 
+    ``audio`` and ``video`` carry whole-track media, one file per ``<track>``,
+    placed under ``audio/`` and ``video/`` as ``{N}.{ext}`` where ``N`` is the
+    1-based position of the ``<track>`` in document order. Each accepts the same
+    forms as ``pages`` (directory, sequence, or ``{track_number: path}`` mapping);
+    the mapping form suits the common sparse case where only some tracks have media.
+
     ``assets`` may be a directory (copied into ``assets/``) or a mapping of
     archive-relative asset path to source file.
 
-    Symbolic links are refused for ``pages`` and ``assets`` (including entries
-    inside directories) so pack does not follow link targets into the archive.
+    Symbolic links are refused for ``pages``, ``audio``, ``video`` and ``assets``
+    (including entries inside directories) so pack does not follow link targets
+    into the archive.
 
     Returns the resolved path to the created archive.
 
@@ -48,5 +57,7 @@ def pack(
         output=output,
         pages=pages,
         assets=assets,
+        audio=audio,
+        video=video,
         validate=validate,
     )
diff --git a/doclang/tokenization.py b/doclang/tokenization.py
index 81d603a..d03923a 100644
--- a/doclang/tokenization.py
+++ b/doclang/tokenization.py
@@ -105,6 +105,19 @@
     "<ldiv/>",
     "<ldiv><marker>",
     "</marker></ldiv>",
+    "<track>",
+    "</track>",
+    "<bdiv/>",
+    "<frame>",
+    "</frame>",
+    "<audio>",
+    "</audio>",
+    "<voice>",
+    "</voice>",
+    '<hours value="',
+    '<minutes value="',
+    '<seconds value="',
+    '<msecs value="',
 )
 
 
@@ -113,6 +126,26 @@ def _location_tokens(resolution: int) -> list[str]:
     return [f'<location value="{value}"/>' for value in range(resolution)]
 
 
+def _hours_tokens() -> list[str]:
+    """Return concrete ``<hours value="N"/>`` tokens for ``N`` in ``[0, 10)``."""
+    return [f'<hours value="{value}"/>' for value in range(10)]
+
+
+def _minutes_tokens() -> list[str]:
+    """Return concrete ``<minutes value="N"/>`` tokens for ``N`` in ``[0, 60)``."""
+    return [f'<minutes value="{value}"/>' for value in range(60)]
+
+
+def _seconds_tokens() -> list[str]:
+    """Return concrete ``<seconds value="N"/>`` tokens for ``N`` in ``[0, 60)``."""
+    return [f'<seconds value="{value}"/>' for value in range(60)]
+
+
+def _msecs_tokens() -> list[str]:
+    """Return concrete ``<msecs value="N"/>`` tokens for ``N`` in ``{0, 10, 20, ..., 990}``."""
+    return [f'<msecs value="{value}"/>' for value in range(0, 1000, 10)]
+
+
 def get_special_tokens(*, max_resolution: int = DEFAULT_MAX_RESOLUTION) -> list[str]:
     """
     Return the DocLang special-token vocabulary as a flat list of token strings.
@@ -125,4 +158,11 @@ def get_special_tokens(*, max_resolution: int = DEFAULT_MAX_RESOLUTION) -> list[
     ``default_resolution@width``/``@height``, or a per-``<location>`` override) used across your
     documents; pass the larger of your x/y resolutions if they differ.
     """
-    return [*_FIXED_TOKENS, *_location_tokens(max_resolution)]
+    return [
+        *_FIXED_TOKENS,
+        *_location_tokens(max_resolution),
+        *_hours_tokens(),
+        *_minutes_tokens(),
+        *_seconds_tokens(),
+        *_msecs_tokens(),
+    ]
diff --git a/examples/archive-demo/audio/1.wav b/examples/archive-demo/audio/1.wav
new file mode 100644
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diff --git a/examples/archive-demo/document.xml b/examples/archive-demo/document.xml
index f46d588..e0b8371 100644
--- a/examples/archive-demo/document.xml
+++ b/examples/archive-demo/document.xml
@@ -18,5 +18,21 @@
     <location value="150"/>
     B
   </text>
+  <track>
+    <location value="40"/>
+    <location value="400"/>
+    <location value="470"/>
+    <location value="470"/>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <minutes value="0"/><seconds value="1"/><msecs value="262"/>
+    <voice>Narrator</voice>
+    Hello from page two.
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/><msecs value="62"/>
+    <minutes value="0"/><seconds value="3"/><msecs value="94"/>
+    <voice>Narrator</voice>
+    That is all for now.
+  </track>
   <page_break/>
 </doclang>
diff --git a/reference/input/examples/track.dclg b/reference/input/examples/track.dclg
new file mode 100644
index 0000000..59726f1
--- /dev/null
+++ b/reference/input/examples/track.dclg
@@ -0,0 +1,16 @@
+<doclang>
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/><msecs value="500"/>
+    <minutes value="0"/><seconds value="5"/>
+    <voice>Alice</voice>
+    Good morning.
+    <voice>Bob</voice>
+    Morning - did you see the report?
+    <bdiv/>
+    <minutes value="59"/><seconds value="58"/><msecs value="450"/>
+    <hours value="1"/><minutes value="0"/><seconds value="1"/><msecs value="210"/>
+    <frame><src uri="assets/frames/00-59-58.jpg"/></frame>
+    Wrapping up as we pass the hour.
+  </track>
+</doclang>
diff --git a/reference/input/reference.xlsx b/reference/input/reference.xlsx
index 7acd09c04c39a2069e562a2ccd42b90becb9eb40..1afac59f42287763fa5fe5ebf334be3fd2c1d791 100644
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diff --git a/spec.md b/spec.md
index f45c3fc..a7ce51b 100644
--- a/spec.md
+++ b/spec.md
@@ -1547,6 +1547,78 @@ Field region with mixed content:
 
 Detailed examples can be seen here: [Form Examples](/examples/form/form-examples.md)
 
+### Tracks
+
+A `<track>` captures a time-aligned media transcript — subtitles, captions, or diarized speech associated with an audio or video recording. It is a [semantic element](#semantic-elements) and may begin with an [element head](#element-head).
+
+The body of a `<track>` is a sequence of *cue blocks*. Each cue block is introduced by a `<bdiv/>` delimiter (analogous to `<ldiv/>` for lists): a non-empty `<track>` body must begin with a `<bdiv/>`, and a cue block spans everything between two sibling `<bdiv/>` elements (or until `</track>`).
+
+A cue block consists of, in order:
+
+- a **start time** (mandatory): a run of `<hours value="H"/>` (optional), `<minutes value="M"/>`, `<seconds value="S"/>`, `<msecs value="MS"/>` (optional). `<minutes>` and `<seconds>` are always present; `<hours>` and `<msecs>` default to `0` when omitted.
+- an **end time** (optional): the same run shape, immediately following the start time. A cue block covers the inclusive interval `[start, end]`. When the end time is omitted it is taken to equal the start time, i.e. the cue block is the single instant `[start, start]` — for example, the timestamp of a `<frame>` or a point annotation.
+- an optional `<frame>` — a still image of the recording at this cue, shaped like a [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
+- an optional `<audio>` — an audio clip for this cue, with the same shape as `<frame>`.
+- an optional **transcript**: a sequence of speaker turns. A turn is an optional `<voice>` (the speaker attribution, which may itself be styled) followed by the spoken text with inline [formatting](#formatting). When `<voice>` is omitted the turn belongs to an undefined speaker; a turn runs until the next `<voice>` or the end of the cue block.
+
+Minimal cue block (start time and one line of text):
+
+```xml
+<track>
+  <bdiv/>
+  <minutes value="0"/><seconds value="2"/>
+  Hello, and welcome.
+</track>
+```
+
+Start and end time, two attributed turns:
+
+```xml
+<track>
+  <bdiv/>
+  <minutes value="0"/><seconds value="2"/><msecs value="500"/>
+  <minutes value="0"/><seconds value="7"/>
+  <voice>John</voice>Hi Mary!
+  <voice><italic>Mary</italic></voice><bold>Hello</bold> John!
+</track>
+```
+
+Cue block with a video frame and an audio clip:
+
+```xml
+<track>
+  <bdiv/>
+  <minutes value="1"/><seconds value="4"/>
+  <minutes value="1"/><seconds value="9"/>
+  <frame><src uri="assets/frames/00-01-04.jpg"/></frame>
+  <audio><src uri="assets/clips/00-01-04.opus"/></audio>
+  <voice>Narrator</voice>The results are shown on screen.
+</track>
+```
+
+Per-cue `<frame>` and `<audio>` reference standalone fragments (a still, a clip) — typically archive `assets/` or a `data:` URI. The complete recording a track's timestamps refer to is carried separately, as `audio/{N}.*` / `video/{N}.*` in a [DocLang archive](#doclang-archive-format).
+
+Crossing the hour mark, and consecutive turns with no speaker attribution:
+
+```xml
+<track>
+  <label value="lecture"/>
+  <bdiv/>
+  <minutes value="59"/><seconds value="58"/><msecs value="450"/>
+  <hours value="1"/><minutes value="0"/><seconds value="1"/><msecs value="210"/>
+  So that concludes the first part.
+  Take a five minute break.
+</track>
+```
+
+Notes:
+
+- A non-empty `<track>` body must begin with a `<bdiv/>`; there must be no text before the first cue block, nor between a `<bdiv/>` and its start time.
+- Every timestamp run carries at least `<minutes>` and `<seconds>`; an end time, when present, must not be earlier than the start time. Cue-block intervals are inclusive of both endpoints; a missing end time means the interval `[start, start]`.
+- Cue blocks appear in non-decreasing order of start time. They may still overlap — for example, two speakers talking at once. When two cue blocks share a start time, their relative order is not further constrained (end times are not used as a tie-breaker).
+- `<msecs value="…"/>` accepts any integer in `[0, 999]`.
+- `<bdiv>`, `<frame>`, `<audio>`, `<voice>`, and the timestamp elements are only meaningful inside a `<track>`.
+
 ### Split structure
 
 We can capture content that is split (e.g. across columns or across pages) using the `<thread thread_id="N"/>` element, where `N` is a unique identifier.
@@ -2475,6 +2547,107 @@ None
 | Raw text | Allowed |
 | Primary semantic elements | Allowed |
 
+##### `<track>`
+
+Captures a time-aligned media transcript (subtitles, captions, or diarized speech). The body is a sequence of cue blocks, each introduced by a [`<bdiv>`](#bdiv) delimiter; a non-empty [`<track>`](#track) body must begin with a [`<bdiv>`](#bdiv). A cue block carries a mandatory start time, an optional end time (each a run of [`<hours>`](#hours)/[`<minutes>`](#minutes)/[`<seconds>`](#seconds)/[`<msecs>`](#msecs)), an optional [`<frame>`](#frame), an optional [`<audio>`](#audio), and an optional transcript of [`<voice>`](#voice)-attributed turns.
+
+###### Allowed Context
+
+Any context that allows semantic elements.
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Only within a cue block transcript |
+| Primary semantic elements | Only [`<frame>`](#frame), [`<audio>`](#audio), and [`<voice>`](#voice), within cue blocks |
+
+###### Example
+
+```xml
+<doclang>
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/><msecs value="500"/>
+    <minutes value="0"/><seconds value="5"/>
+    <voice>Alice</voice>
+    Good morning.
+    <voice>Bob</voice>
+    Morning - did you see the report?
+    <bdiv/>
+    <minutes value="59"/><seconds value="58"/><msecs value="450"/>
+    <hours value="1"/><minutes value="0"/><seconds value="1"/><msecs value="210"/>
+    <frame><src uri="assets/frames/00-59-58.jpg"/></frame>
+    Wrapping up as we pass the hour.
+  </track>
+</doclang>
+```
+
+##### `<frame>`
+
+A still image of the recording at a [`<track>`](#track) cue block. Shaped like [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
+
+###### Allowed Context
+
+Can only appear inside a [`<track>`](#track) cue block.
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Not allowed |
+| Primary semantic elements | Allowed |
+
+##### `<audio>`
+
+An audio clip for a [`<track>`](#track) cue block. Same shape as [`<frame>`](#frame): an optional element head followed by an optional [`<src>`](#src).
+
+###### Allowed Context
+
+Can only appear inside a [`<track>`](#track) cue block.
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Not allowed |
+| Primary semantic elements | Allowed |
+
+##### `<voice>`
+
+Speaker attribution for a transcript turn within a [`<track>`](#track) cue block. Handled like [`<text>`](#text) (may carry its own element head and inline formatting).
+
+###### Allowed Context
+
+Can only appear inside a [`<track>`](#track) cue block.
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Allowed |
+| Primary semantic elements | Allowed |
+
 #### Property Elements
 
 *Property elements* are non-semantic elements that help define useful traits of a semantic element, forming the main building blocks of the [element head](#element-head). Property elements that can appear on the top level of the element head are called *primary*, while those that can only appear within other property elements are called *secondary*. The various property elements are further specified in the following subsections.
@@ -2732,6 +2905,78 @@ None
 | Raw text | Allowed |
 | Primary semantic elements | Not allowed |
 
+##### `<hours>`
+
+Hours component of a [`<track>`](#track) cue timestamp. Optional within a timestamp run (defaults to 0).
+
+###### Allowed Context
+
+Can only be part of a timestamp run in a [`<track>`](#track) cue block.
+
+###### Attributes
+
+| Attribute | Required / Optional | Allowed Values | Description |
+|-----------|----------|----------------|-------------|
+| `value` | Required | Non-negative integer | Hours component of a track cue timestamp. |
+
+###### Allowed Content Types
+
+None (empty element).
+
+##### `<minutes>`
+
+Minutes component of a [`<track>`](#track) cue timestamp.
+
+###### Allowed Context
+
+Can only be part of a timestamp run in a [`<track>`](#track) cue block.
+
+###### Attributes
+
+| Attribute | Required / Optional | Allowed Values | Description |
+|-----------|----------|----------------|-------------|
+| `value` | Required | Integer within [0, 59] | Minutes component of a track cue timestamp. |
+
+###### Allowed Content Types
+
+None (empty element).
+
+##### `<seconds>`
+
+Seconds component of a [`<track>`](#track) cue timestamp.
+
+###### Allowed Context
+
+Can only be part of a timestamp run in a [`<track>`](#track) cue block.
+
+###### Attributes
+
+| Attribute | Required / Optional | Allowed Values | Description |
+|-----------|----------|----------------|-------------|
+| `value` | Required | Integer within [0, 59] | Seconds component of a track cue timestamp. |
+
+###### Allowed Content Types
+
+None (empty element).
+
+##### `<msecs>`
+
+Milliseconds component of a [`<track>`](#track) cue timestamp. Optional within a timestamp run (defaults to 0).
+
+###### Allowed Context
+
+Can only be part of a timestamp run in a [`<track>`](#track) cue block.
+
+###### Attributes
+
+| Attribute | Required / Optional | Allowed Values | Description |
+|-----------|----------|----------------|-------------|
+| `value` | Required | Integer within [0, 999] | Milliseconds component of a track cue timestamp. |
+
+###### Allowed Content Types
+
+None (empty element).
+
 #### Formatting Elements
 
 Formatting elements modify the styling and presentation within semantic or other formatting elements.
@@ -3080,6 +3325,22 @@ None
 | Raw text | Not allowed |
 | Primary semantic elements | Only [`<marker>`](#marker) |
 
+##### `<bdiv>`
+
+Indicates the beginning of a [`<track>`](#track) cue block.
+
+###### Allowed Context
+
+Can only be a child of [`<track>`](#track).
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+None (empty element).
+
 #### Document Head Elements
 
 This category comprises the document-level metadata elements that are the building blocks of [`<head>`](#head).
@@ -3117,12 +3378,14 @@ _rels/
   .rels                # required — package → main document
 document.xml           # required — valid DocLang document
 pages/                 # optional — page images, e.g. 1.png, 2.png
+audio/                 # optional — whole-track audio, e.g. 2.mp3, 4.ogg
+video/                 # optional — whole-track video, e.g. 3.mp4, 4.mkv
 assets/                # optional — files referenced from markup
 ```
 
 ##### `[Content_Types].xml` (required)
 
-Declares content types for package parts. MUST include an `<Override>` for `/document.xml` with content type `application/vnd.doclang.document+xml`. SHOULD declare defaults for common image extensions used under `pages/` (`png`, `jpg`, `jpeg`, `webp`) and for `.rels` parts. This media type may be registered with IANA in a future revision; conformance does not depend on registration.
+Declares content types for package parts. MUST include an `<Override>` for `/document.xml` with content type `application/vnd.doclang.document+xml`, and a `<Default>` (or per-part `<Override>`) for **every** extension present in the package. SHOULD declare defaults for common image extensions used under `pages/` (`png`, `jpg`, `jpeg`, `webp`), for audio/video extensions used under `audio/` / `video/` (e.g. `mp3` → `audio/mpeg`, `m4a` → `audio/mp4`, `ogg`/`opus` → `audio/ogg`, `wav` → `audio/wav`, `flac` → `audio/flac`, `mp4` → `video/mp4`, `webm` → `video/webm`, `mkv` → `video/x-matroska`, `mov` → `video/quicktime`), and for `.rels` parts. This media type may be registered with IANA in a future revision; conformance does not depend on registration.
 
 Example:
 
@@ -3131,6 +3394,8 @@ Example:
 <Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
   <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
   <Default Extension="png" ContentType="image/png"/>
+  <Default Extension="mp3" ContentType="audio/mpeg"/>
+  <Default Extension="mp4" ContentType="video/mp4"/>
   <Override PartName="/document.xml" ContentType="application/vnd.doclang.document+xml"/>
 </Types>
 ```
@@ -3158,6 +3423,12 @@ The main document part: a valid DocLang document. Top-level `<page_break/>` elem
 
 Optional raster images for review. Name files `{N}.{png|jpg|jpeg|webp}` with 1-based `N`. Gaps are allowed.
 
+##### `audio/` (optional)
+
+##### `video/` (optional)
+
+Optional whole-track media. Name files `{N}.{ext}` where `N` is the 1-based position of the corresponding [`<track>`](#track) in document reading order (counting every `<track>`, including nested ones). A track has a whole-track audio recording when `audio/{N}.*` is present, and a whole-track video recording when `video/{N}.*` is present — either, both, or neither. At most one file per track per modality. Gaps are allowed; `N` MUST NOT exceed the number of `<track>` elements in the document.
+
 ##### `assets/` (optional)
 
 Optional payload referenced by relative URIs in markup (e.g. `<src uri="assets/chart.svg"/>`). URIs resolve from the archive root.
@@ -3166,6 +3437,10 @@ Optional payload referenced by relative URIs in markup (e.g. `<src uri="assets/c
 
 Review tools split markup (excluding `<head>`) on `<page_break/>`; segment *N* corresponds to page *N*. Page count is determined by markup: the number of `<page_break/>` elements plus one. Page images are optional and individual gaps are allowed, but page files must not exceed this count (e.g. two `<page_break/>` elements define three pages, so `4.png` is out of bounds).
 
+#### Track alignment
+
+The *N*-th [`<track>`](#track) in the document aligns with `audio/{N}.*` and/or `video/{N}.*` when present. A cue block's timestamps are then playback offsets into that file, measured from its start (`00:00:00.000`). Per-cue [`<frame>`](#frame) and [`<audio>`](#audio) fragments are independent references (via [`<src>`](#src)) and are not derived from the whole-track files. A track with neither an `audio/` nor a `video/` entry is simply a transcript whose timestamps refer to a recording the archive does not carry.
+
 ### Recommendations
 
 This appendix is informative and does not define conformance requirements.
@@ -3325,7 +3600,24 @@ The token vocabulary trades off size and inference cost:
 | `<ldiv/>` | [`ldiv`](#ldiv) |
 | `<ldiv><marker>` | start of [`ldiv`](#ldiv) with [`marker`](#marker) |
 | `</marker></ldiv>` | end of [`ldiv`](#ldiv) with [`marker`](#marker) |
+| `<track>` | [`track`](#track) start |
+| `</track>` | [`track`](#track) end |
+| `<bdiv/>` | [`bdiv`](#bdiv) cue-block delimiter |
+| `<frame>` | [`frame`](#frame) start |
+| `</frame>` | [`frame`](#frame) end |
+| `<audio>` | [`audio`](#audio) start |
+| `</audio>` | [`audio`](#audio) end |
+| `<voice>` | [`voice`](#voice) start |
+| `</voice>` | [`voice`](#voice) end |
+| `<hours value="` | [`hours`](#hours) with `value` attribute start (out-of-range values) |
+| `<minutes value="` | [`minutes`](#minutes) with `value` attribute start (out-of-range values) |
+| `<seconds value="` | [`seconds`](#seconds) with `value` attribute start (out-of-range values) |
+| `<msecs value="` | [`msecs`](#msecs) with `value` attribute start (out-of-range values) |
 | `<location value="0"/>`, `<location value="1"/>`, ..., `<location value="511"/>` | [`location`](#location) tokens with values from 0 to 511 |
+| `<hours value="0"/>`, `<hours value="1"/>`, ..., `<hours value="9"/>` | [`hours`](#hours) tokens with values from 0 to 9 |
+| `<minutes value="0"/>`, `<minutes value="1"/>`, ..., `<minutes value="59"/>` | [`minutes`](#minutes) tokens with values from 0 to 59 |
+| `<seconds value="0"/>`, `<seconds value="1"/>`, ..., `<seconds value="59"/>` | [`seconds`](#seconds) tokens with values from 0 to 59 |
+| `<msecs value="0"/>`, `<msecs value="10"/>`, ..., `<msecs value="990"/>` | [`msecs`](#msecs) tokens with values in multiples of 10 from 0 to 990 |
 
 ### Future Extensions
 
@@ -3335,6 +3627,14 @@ These features are considered for future versions of the standard.
 
 Horizontal threading enables linking related content across the horizontal axis in page or table layouts. The `h_thread` element supports this by explicitly connecting content (like table rows or columns) that spans multiple pages, ensuring these threads remain structured and traceable.
 
+#### Explicitly wrapped repetitive items
+
+Repetitive structures currently rely on a bare delimiter plus unwrapped content: `<ldiv/>` for [list](#list) items, cell tokens for [table](#table) cells, and `<bdiv/>` for [track](#track) cue blocks. A future revision may allow each item to alternatively be written as an explicit wrapper element carrying its own element head, in a way that stays backward compatible with the delimiter form and remains consistent across all three modalities.
+
+#### Multi-part track media
+
+The [archive format](#doclang-archive-format) carries at most one whole-track file per [`<track>`](#track) per modality (`audio/{N}.*`, `video/{N}.*`). A future revision may add a backward-compatible form for media split into ordered segments (e.g. an `audio/{N}/` directory plus a small manifest giving each segment's start offset), for very long recordings or capture that was paused and resumed.
+
 #### Metadata
 
 ##### `<head>`
diff --git a/tests/data/invalid/nok_bdiv_invalid_scope.dclg b/tests/data/invalid/nok_bdiv_invalid_scope.dclg
new file mode 100644
index 0000000..3742fa7
--- /dev/null
+++ b/tests/data/invalid/nok_bdiv_invalid_scope.dclg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <bdiv/>
+</doclang>
diff --git a/tests/data/invalid/nok_track_blocks_out_of_order.dclg b/tests/data/invalid/nok_track_blocks_out_of_order.dclg
new file mode 100644
index 0000000..39c870e
--- /dev/null
+++ b/tests/data/invalid/nok_track_blocks_out_of_order.dclg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- cue blocks must be in non-decreasing order of start time -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="30"/>
+    Second, chronologically.
+    <bdiv/>
+    <minutes value="0"/><seconds value="10"/>
+    But it comes first in the timeline.
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_cue_block_missing_timestamp.dclg b/tests/data/invalid/nok_track_cue_block_missing_timestamp.dclg
new file mode 100644
index 0000000..eefcc5b
--- /dev/null
+++ b/tests/data/invalid/nok_track_cue_block_missing_timestamp.dclg
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a cue block must open with a start timestamp -->
+  <track>
+    <bdiv/>
+    Just some text, no timestamp.
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_end_before_start.dclg b/tests/data/invalid/nok_track_end_before_start.dclg
new file mode 100644
index 0000000..7b1066f
--- /dev/null
+++ b/tests/data/invalid/nok_track_end_before_start.dclg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- end timestamp must not be earlier than the start timestamp -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="10"/>
+    <minutes value="0"/><seconds value="5"/>
+    Time runs backwards.
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_frame_before_timestamp.dclg b/tests/data/invalid/nok_track_frame_before_timestamp.dclg
new file mode 100644
index 0000000..9d2e8d1
--- /dev/null
+++ b/tests/data/invalid/nok_track_frame_before_timestamp.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- frame may only appear after the timestamp run(s) -->
+  <track>
+    <bdiv/>
+    <frame><src uri="frames/x.jpg"/></frame>
+    <minutes value="0"/><seconds value="1"/>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_frame_src_after_body.dclg b/tests/data/invalid/nok_track_frame_src_after_body.dclg
new file mode 100644
index 0000000..7a8082e
--- /dev/null
+++ b/tests/data/invalid/nok_track_frame_src_after_body.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- inside a frame, src must precede any virtual-text body content -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="1"/>
+    <frame><bold>caption</bold><src uri="frames/x.jpg"/></frame>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_frame_two_src.dclg b/tests/data/invalid/nok_track_frame_two_src.dclg
new file mode 100644
index 0000000..a053c16
--- /dev/null
+++ b/tests/data/invalid/nok_track_frame_two_src.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a frame may hold at most one src -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="1"/>
+    <frame><src uri="a.jpg"/><src uri="b.jpg"/></frame>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_minutes_out_of_range.dclg b/tests/data/invalid/nok_track_minutes_out_of_range.dclg
new file mode 100644
index 0000000..f2a98e2
--- /dev/null
+++ b/tests/data/invalid/nok_track_minutes_out_of_range.dclg
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <track>
+    <bdiv/>
+    <minutes value="60"/><seconds value="1"/>
+    Minutes must be within [0, 59].
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_missing_seconds.dclg b/tests/data/invalid/nok_track_missing_seconds.dclg
new file mode 100644
index 0000000..d000423
--- /dev/null
+++ b/tests/data/invalid/nok_track_missing_seconds.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a timestamp run requires both minutes and seconds -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/>
+    Seconds are missing.
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_msecs_out_of_range.dclg b/tests/data/invalid/nok_track_msecs_out_of_range.dclg
new file mode 100644
index 0000000..524b5c7
--- /dev/null
+++ b/tests/data/invalid/nok_track_msecs_out_of_range.dclg
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="1"/><msecs value="1000"/>
+    Milliseconds must be within [0, 999].
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_no_bdiv.dclg b/tests/data/invalid/nok_track_no_bdiv.dclg
new file mode 100644
index 0000000..9e68b70
--- /dev/null
+++ b/tests/data/invalid/nok_track_no_bdiv.dclg
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- non-empty track body must begin with <bdiv/> -->
+  <track>
+    <minutes value="0"/><seconds value="1"/>
+    Missing the cue-block delimiter.
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_text_before_timestamp.dclg b/tests/data/invalid/nok_track_text_before_timestamp.dclg
new file mode 100644
index 0000000..1372f6c
--- /dev/null
+++ b/tests/data/invalid/nok_track_text_before_timestamp.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- no non-whitespace text between a <bdiv/> and its start timestamp -->
+  <track>
+    <bdiv/>
+    stray text
+    <minutes value="0"/><seconds value="1"/>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_third_timestamp.dclg b/tests/data/invalid/nok_track_third_timestamp.dclg
new file mode 100644
index 0000000..872c181
--- /dev/null
+++ b/tests/data/invalid/nok_track_third_timestamp.dclg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a cue block allows at most a start and an end timestamp -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="1"/>
+    <minutes value="0"/><seconds value="2"/>
+    <minutes value="0"/><seconds value="3"/>
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_element_head.dclg b/tests/data/valid/ok_track_element_head.dclg
new file mode 100644
index 0000000..15825ad
--- /dev/null
+++ b/tests/data/valid/ok_track_element_head.dclg
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- track-level element head, plus a frame carrying its own element head; two cue blocks -->
+  <track>
+    <label value="lecture"/>
+    <location value="10"/><location value="20"/><location value="300"/><location value="60"/>
+    <caption>Opening remarks</caption>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <minutes value="0"/><seconds value="4"/>
+    <voice>Speaker</voice>
+    Welcome everyone.
+    <bdiv/>
+    <minutes value="0"/><seconds value="4"/>
+    <frame>
+      <location value="0"/><location value="0"/><location value="320"/><location value="240"/>
+      <src uri="assets/frames/00-04.jpg"/>
+    </frame>
+    Let's begin.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_frame_audio.dclg b/tests/data/valid/ok_track_frame_audio.dclg
new file mode 100644
index 0000000..29fff19
--- /dev/null
+++ b/tests/data/valid/ok_track_frame_audio.dclg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <track>
+    <bdiv/>
+    <minutes value="1"/><seconds value="4"/>
+    <minutes value="1"/><seconds value="9"/>
+    <frame><src uri="assets/frames/00-01-04.jpg"/></frame>
+    <audio><src uri="assets/clips/00-01-04.opus"/></audio>
+    <voice>Narrator</voice>
+    The results are shown on screen.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_frame_point.dclg b/tests/data/valid/ok_track_frame_point.dclg
new file mode 100644
index 0000000..4ea0346
--- /dev/null
+++ b/tests/data/valid/ok_track_frame_point.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- no end time: the cue block is the single instant [start, start], pinning a frame -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="12"/><msecs value="400"/>
+    <frame><src uri="assets/frames/00-12-400.jpg"/></frame>
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_in_group_and_cell.dclg b/tests/data/valid/ok_track_in_group_and_cell.dclg
new file mode 100644
index 0000000..52d925b
--- /dev/null
+++ b/tests/data/valid/ok_track_in_group_and_cell.dclg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- track is a primary semantic element: valid inside a group and inside a table cell -->
+  <group>
+    <track>
+      <bdiv/>
+      <minutes value="0"/><seconds value="2"/>
+      Inside a group.
+    </track>
+  </group>
+  <table>
+    <fcel/>
+    <track>
+      <bdiv/>
+      <minutes value="0"/><seconds value="3"/>
+      Inside a table cell.
+    </track>
+    <nl/>
+  </table>
+</doclang>
diff --git a/tests/data/valid/ok_track_inline_formatting.dclg b/tests/data/valid/ok_track_inline_formatting.dclg
new file mode 100644
index 0000000..2825a56
--- /dev/null
+++ b/tests/data/valid/ok_track_inline_formatting.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="6"/>
+    <voice>Guest</voice>
+    That was <bold>completely</bold> <italic>unexpected</italic>.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_minimal.dclg b/tests/data/valid/ok_track_minimal.dclg
new file mode 100644
index 0000000..069d35c
--- /dev/null
+++ b/tests/data/valid/ok_track_minimal.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- single cue block: start time only, unwrapped transcript text -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/>
+    Hello, and welcome.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_overlapping_blocks.dclg b/tests/data/valid/ok_track_overlapping_blocks.dclg
new file mode 100644
index 0000000..617a160
--- /dev/null
+++ b/tests/data/valid/ok_track_overlapping_blocks.dclg
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- overlapping cue blocks are allowed (e.g. simultaneous speakers) -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/>
+    <minutes value="0"/><seconds value="8"/>
+    <voice>Alice</voice>
+    ... and that's the main point.
+    <bdiv/>
+    <minutes value="0"/><seconds value="6"/>
+    <minutes value="0"/><seconds value="9"/>
+    <voice>Bob</voice>
+    Exactly right.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_start_end_runs.dclg b/tests/data/valid/ok_track_start_end_runs.dclg
new file mode 100644
index 0000000..45d7918
--- /dev/null
+++ b/tests/data/valid/ok_track_start_end_runs.dclg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- start + end timestamp, with optional hours and msecs, crossing the hour mark -->
+  <track>
+    <bdiv/>
+    <minutes value="59"/><seconds value="58"/><msecs value="450"/>
+    <hours value="1"/><minutes value="0"/><seconds value="1"/><msecs value="210"/>
+    So that concludes the first part.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_tied_start_times.dclg b/tests/data/valid/ok_track_tied_start_times.dclg
new file mode 100644
index 0000000..76d460c
--- /dev/null
+++ b/tests/data/valid/ok_track_tied_start_times.dclg
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- two cue blocks sharing a start time; end times not used as a tie-breaker -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="4"/>
+    <minutes value="0"/><seconds value="12"/>
+    <voice>Alice</voice>
+    That's the long version.
+    <bdiv/>
+    <minutes value="0"/><seconds value="4"/>
+    <minutes value="0"/><seconds value="6"/>
+    <voice>Bob</voice>
+    Yep.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_voices.dclg b/tests/data/valid/ok_track_voices.dclg
new file mode 100644
index 0000000..525cd21
--- /dev/null
+++ b/tests/data/valid/ok_track_voices.dclg
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <track>
+    <!-- speaker name in <voice>; the utterance follows as a sibling -->
+    <bdiv/>
+    <minutes value="0"/><seconds value="2"/>
+    <voice>John</voice>
+    Hi Mary!
+    <voice><italic>Mary</italic></voice>
+    <bold>Hello</bold> John!
+    <bdiv/>
+    <minutes value="0"/><seconds value="9"/>
+    First unattributed line.
+    Second unattributed line.
+  </track>
+</doclang>
diff --git a/tests/test_packaging.py b/tests/test_packaging.py
index 76d5a13..4fc2b9c 100644
--- a/tests/test_packaging.py
+++ b/tests/test_packaging.py
@@ -82,6 +82,87 @@ def test_pack_with_pages_mapping(tmp_path: Path) -> None:
     assert "pages/2.png" not in members
 
 
+def test_pack_archive_demo_with_audio_directory(tmp_path: Path) -> None:
+    output = tmp_path / "demo.dclx"
+
+    pack(
+        ARCHIVE_DEMO / "document.xml",
+        output=output,
+        pages=ARCHIVE_DEMO / "pages",
+        audio=ARCHIVE_DEMO / "audio",
+        validate=True,
+    )
+
+    members = _zip_members(output)
+    assert "audio/1.wav" in members
+    assert "pages/1.png" in members
+
+
+def test_pack_with_audio_and_video_mapping(tmp_path: Path) -> None:
+    document = VALID_DIR / "ok_track_frame_audio.dclg"
+    source = ARCHIVE_DEMO / "pages" / "1.png"
+    track_two_audio = tmp_path / "two.mp3"
+    track_two_audio.write_bytes(source.read_bytes())
+    track_three_video = tmp_path / "three.mp4"
+    track_three_video.write_bytes(source.read_bytes())
+    output = tmp_path / "media.dclx"
+
+    pack(document, output=output, audio={2: track_two_audio}, video={3: track_three_video})
+
+    members = _zip_members(output)
+    assert "audio/2.mp3" in members
+    assert "video/3.mp4" in members
+    assert "audio/1.mp3" not in members
+
+
+def test_pack_with_audio_sequence_renumbers_from_one(tmp_path: Path) -> None:
+    document = VALID_DIR / "ok_track_frame_audio.dclg"
+    source = ARCHIVE_DEMO / "pages" / "1.png"
+    first = tmp_path / "a.ogg"
+    first.write_bytes(source.read_bytes())
+    output = tmp_path / "seq.dclx"
+
+    pack(document, output=output, audio=[first])
+
+    assert "audio/1.ogg" in _zip_members(output)
+
+
+def test_pack_with_video_directory_preserves_names(tmp_path: Path) -> None:
+    document = VALID_DIR / "ok_track_frame_audio.dclg"
+    source = ARCHIVE_DEMO / "pages" / "1.png"
+    video_dir = tmp_path / "clips"
+    video_dir.mkdir()
+    (video_dir / "3.webm").write_bytes(source.read_bytes())
+    output = tmp_path / "viddir.dclx"
+
+    pack(document, output=output, video=video_dir)
+
+    assert "video/3.webm" in _zip_members(output)
+
+
+def test_pack_rejects_zero_audio_track_number(tmp_path: Path) -> None:
+    document = VALID_DIR / "ok_track_frame_audio.dclg"
+    source = tmp_path / "a.mp3"
+    source.write_bytes(b"audio")
+
+    with pytest.raises(PackagingError, match="positive integers"):
+        pack(document, output=tmp_path / "bad.dclx", audio={0: source})
+
+
+def test_pack_rejects_symlink_audio_file(tmp_path: Path) -> None:
+    document = VALID_DIR / "ok_track_frame_audio.dclg"
+    secret = tmp_path / "secret.mp3"
+    secret.write_bytes(b"audio")
+    link = tmp_path / "1.mp3"
+    link.symlink_to(secret)
+    output = tmp_path / "symlink-audio.dclx"
+
+    with pytest.raises(PackagingError, match="symbolic link"):
+        pack(document, output=output, audio=[link])
+
+    assert not output.exists()
+
+
 def test_pack_with_asset_mapping(tmp_path: Path) -> None:
     document = VALID_DIR / "ok_description_element_head.dclg"
     asset_source = ARCHIVE_DEMO / "pages" / "1.png"
diff --git a/tests/test_tokenization.py b/tests/test_tokenization.py
index 5c5598a..e4a4b79 100644
--- a/tests/test_tokenization.py
+++ b/tests/test_tokenization.py
@@ -5,12 +5,30 @@
 import re
 from pathlib import Path
 
-from doclang.tokenization import DEFAULT_MAX_RESOLUTION, get_special_tokens
+from doclang.tokenization import get_special_tokens
 
 SPEC_PATH = Path(__file__).resolve().parents[1] / "spec.md"
 
 _ROW_RE = re.compile(r"^\|(.+)\|(.+)\|\s*$", re.MULTILINE)
 _BACKTICK_RE = re.compile(r"`([^`]*)`")
+_RANGE_TOKEN_RE = re.compile(r'^(<\w+ value=")(\d+)("/>)$')
+
+
+def _parse_range_token(token: str) -> tuple[str, int, str]:
+    match = _RANGE_TOKEN_RE.match(token)
+    assert match is not None, f'not a `<name value="N"/>` token: {token!r}'
+    return match.group(1), int(match.group(2)), match.group(3)
+
+
+def _expand_range_row(backticked: list[str]) -> list[str]:
+    """Expand a ``...`` token-vocabulary row (e.g. ``<location value="0"/>``, ``<location
+    value="1"/>``, ..., ``<location value="511"/>``) into every concrete token, inferring the
+    step from the first two listed values and the bounds from the first and last."""
+    prefix, first, suffix = _parse_range_token(backticked[0])
+    _, second, _ = _parse_range_token(backticked[1])
+    _, last, _ = _parse_range_token(backticked[-1])
+    step = second - first
+    return [f"{prefix}{value}{suffix}" for value in range(first, last + 1, step)]
 
 
 def _tokens_from_spec() -> list[str]:
@@ -23,8 +41,7 @@ def _tokens_from_spec() -> list[str]:
         if column in ("Token", "---") or not column.startswith("`"):
             continue
         if "..." in column:
-            # The location row lists a `<location value="0"/>` ... `<location value="511"/>` range.
-            tokens.extend(f'<location value="{value}"/>' for value in range(DEFAULT_MAX_RESOLUTION))
+            tokens.extend(_expand_range_row(_BACKTICK_RE.findall(column)))
             continue
         tokens.extend(_BACKTICK_RE.findall(column))
 

From bd4a298f3ae2403d09554272dae3fb0921617f38 Mon Sep 17 00:00:00 2001
From: Panos Vagenas <pva@zurich.ibm.com>
Date: Wed, 2 Sep 2026 11:13:53 +0200
Subject: [PATCH 2/5] add `<chapter>`, refine `<frame>`/`<audio>` semantics
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- `<chapter>`: an optional cue-block title, placed after the timestamps and before
  `<frame>`; it marks a chapter boundary at the cue block's start time only, and
  chapters form a flat non-overlapping partition of the timeline (no nesting, no
  explicit end — the next `<chapter>` or `</track>` closes it)
- `<audio>` is now the recording over the cue block's `[start, end]` interval — a
  temporal crop, the way a `<picture>` crop corresponds to its page region;
  timestamps are authoritative, the clip is a best-effort fragment, and its exact
  duration is not checked. `<frame>` stays the still at the start time
- Schematron: `track-audio-requires-end` (a cue block with `<audio>` must carry an
  end time) and `track-chapter-strictly-increasing` (two chapters cannot mark the
  same instant)
- token vocabulary gains `<chapter>` / `</chapter>`; `### Reference` regenerated
  with the `<chapter>` entry and the revised `<frame>`/`<audio>` wording
- tests: chapter fixtures (valid + invalid) and `nok_track_audio_without_end`

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
---
 doclang/doclang.sch                           |  52 ++++++++++++++-
 doclang/doclang.xsd                           |   7 +-
 doclang/tokenization.py                       |   2 +
 reference/input/reference.xlsx                | Bin 16466 -> 16827 bytes
 spec.md                                       |  61 ++++++++++++++++--
 .../invalid/nok_track_audio_without_end.dclg  |   9 +++
 .../nok_track_chapter_after_frame.dclg        |  10 +++
 .../nok_track_chapter_before_timestamp.dclg   |  10 +++
 .../nok_track_two_chapters_same_start.dclg    |  14 ++++
 .../ok_track_chapter_boundary_mid_cue.dclg    |  16 +++++
 .../valid/ok_track_chapter_element_head.dclg  |  13 ++++
 tests/data/valid/ok_track_chapters.dclg       |  20 ++++++
 12 files changed, 207 insertions(+), 7 deletions(-)
 create mode 100644 tests/data/invalid/nok_track_audio_without_end.dclg
 create mode 100644 tests/data/invalid/nok_track_chapter_after_frame.dclg
 create mode 100644 tests/data/invalid/nok_track_chapter_before_timestamp.dclg
 create mode 100644 tests/data/invalid/nok_track_two_chapters_same_start.dclg
 create mode 100644 tests/data/valid/ok_track_chapter_boundary_mid_cue.dclg
 create mode 100644 tests/data/valid/ok_track_chapter_element_head.dclg
 create mode 100644 tests/data/valid/ok_track_chapters.dclg

diff --git a/doclang/doclang.sch b/doclang/doclang.sch
index fc59659..665f30d 100644
--- a/doclang/doclang.sch
+++ b/doclang/doclang.sch
@@ -101,7 +101,7 @@
     <sch:rule context="dl:text | dl:heading | dl:code | dl:formula | dl:caption | dl:description | dl:summary |
                        dl:page_header | dl:page_footer | dl:footnote | dl:picture | dl:marker |
                        dl:field_region | dl:field_heading | dl:field_item | dl:key | dl:value |
-                       dl:list | dl:table | dl:index | dl:group | dl:track | dl:voice | dl:frame | dl:audio">
+                       dl:list | dl:table | dl:index | dl:group | dl:track | dl:voice | dl:chapter | dl:frame | dl:audio">
       <sch:let name="header-elements" value="dl:label | dl:thread | dl:xref | dl:href | dl:layer | dl:location | dl:caption | dl:description | dl:summary | dl:custom"/>
 
       <sch:let name="text-before-header" value="text()[following-sibling::*[self::dl:label or self::dl:thread or self::dl:xref or self::dl:href or self::dl:layer or self::dl:location or self::dl:caption or self::dl:description or self::dl:summary or self::dl:custom]]"/>
@@ -479,4 +479,54 @@
     </sch:rule>
   </sch:pattern>
 
+  <!-- ============================================ -->
+  <!-- TRACK CHAPTER: a <chapter> marks a boundary at its cue block's start time; -->
+  <!-- consecutive chapter boundaries must be strictly increasing (no two chapters at one instant) -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-chapter-strictly-increasing">
+    <sch:rule context="dl:track/dl:chapter[preceding-sibling::dl:chapter]">
+      <!-- start time of the cue block this <chapter> belongs to (first timestamp run after its <bdiv>) -->
+      <sch:let name="m1" value="preceding-sibling::dl:bdiv[1]/following-sibling::dl:minutes[1]"/>
+      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
+                                      + 60000 * number($m1/@value)
+                                      + 1000 * number($s1/@value)
+                                      + (if ($ms1) then number($ms1/@value) else 0)"/>
+
+      <sch:let name="pm1" value="preceding-sibling::dl:chapter[1]/preceding-sibling::dl:bdiv[1]/following-sibling::dl:minutes[1]"/>
+      <sch:let name="ph1" value="$pm1/preceding-sibling::*[1][self::dl:hours]"/>
+      <sch:let name="ps1" value="$pm1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="pms1" value="$ps1/following-sibling::*[1][self::dl:msecs]"/>
+      <sch:let name="prev-start-ms" value="3600000 * (if ($ph1) then number($ph1/@value) else 0)
+                                           + 60000 * number($pm1/@value)
+                                           + 1000 * number($ps1/@value)
+                                           + (if ($pms1) then number($pms1/@value) else 0)"/>
+
+      <sch:assert test="$start-ms gt $prev-start-ms">
+        Each chapter must begin strictly later than the previous chapter; two chapters cannot mark the same instant.
+        Found this chapter start=<sch:value-of select="$start-ms"/>ms, previous chapter start=<sch:value-of select="$prev-start-ms"/>ms.
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
+  <!-- ============================================ -->
+  <!-- TRACK CUE BLOCK: an <audio> clip spans [start, end], so its cue block needs an end time -->
+  <!-- ============================================ -->
+
+  <sch:pattern id="track-audio-requires-end">
+    <sch:rule context="dl:track/dl:bdiv">
+      <sch:let name="next-bdiv" value="following-sibling::dl:bdiv[1]"/>
+      <sch:let name="cue" value="if ($next-bdiv)
+                                 then following-sibling::*[following-sibling::dl:bdiv[1] is $next-bdiv]
+                                 else following-sibling::*"/>
+
+      <sch:assert test="not($cue[self::dl:audio]) or count($cue[self::dl:minutes]) = 2">
+        A track cue block with an audio clip must carry an end time; the clip spans the cue block's interval [start, end].
+      </sch:assert>
+    </sch:rule>
+  </sch:pattern>
+
 </sch:schema>
diff --git a/doclang/doclang.xsd b/doclang/doclang.xsd
index 7aad29a..2b35836 100644
--- a/doclang/doclang.xsd
+++ b/doclang/doclang.xsd
@@ -765,6 +765,10 @@
   <!-- VOICE ELEMENT: speaker attribution; same content model as <text> -->
   <xs:element name="voice" type="dl:component_with_semantic_seq"/>
 
+  <!-- CHAPTER ELEMENT: chapter/section title marking a boundary at its cue block's start time -->
+  <!-- Same content model as <text>; effective only from the start time of the cue block that carries it -->
+  <xs:element name="chapter" type="dl:component_with_semantic_seq"/>
+
   <!-- Transcript region: <voice>-attributed turns plus inline-formatted / raw text -->
   <xs:group name="transcript_content">
     <xs:choice>
@@ -774,12 +778,13 @@
     </xs:choice>
   </xs:group>
 
-  <!-- TRACK_CUE_BLOCK: bdiv + start timestamp + optional end timestamp + optional frame/audio + optional transcript -->
+  <!-- TRACK_CUE_BLOCK: bdiv + start timestamp + optional end timestamp + optional chapter + optional frame/audio + optional transcript -->
   <xs:group name="track_cue_block">
     <xs:sequence>
       <xs:element ref="dl:bdiv"/>
       <xs:group ref="dl:timestamp"/>
       <xs:group ref="dl:timestamp" minOccurs="0"/>
+      <xs:element ref="dl:chapter" minOccurs="0"/>
       <xs:element ref="dl:frame" minOccurs="0"/>
       <xs:element ref="dl:audio" minOccurs="0"/>
       <xs:group ref="dl:transcript_content" minOccurs="0" maxOccurs="unbounded"/>
diff --git a/doclang/tokenization.py b/doclang/tokenization.py
index d03923a..4abd5bb 100644
--- a/doclang/tokenization.py
+++ b/doclang/tokenization.py
@@ -114,6 +114,8 @@
     "</audio>",
     "<voice>",
     "</voice>",
+    "<chapter>",
+    "</chapter>",
     '<hours value="',
     '<minutes value="',
     '<seconds value="',
diff --git a/reference/input/reference.xlsx b/reference/input/reference.xlsx
index 1afac59f42287763fa5fe5ebf334be3fd2c1d791..4057b87a84a3a71ed9038f6ee0ca047b7bad36c6 100644
GIT binary patch
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diff --git a/spec.md b/spec.md
index a7ce51b..c4bdbb8 100644
--- a/spec.md
+++ b/spec.md
@@ -1557,8 +1557,9 @@ A cue block consists of, in order:
 
 - a **start time** (mandatory): a run of `<hours value="H"/>` (optional), `<minutes value="M"/>`, `<seconds value="S"/>`, `<msecs value="MS"/>` (optional). `<minutes>` and `<seconds>` are always present; `<hours>` and `<msecs>` default to `0` when omitted.
 - an **end time** (optional): the same run shape, immediately following the start time. A cue block covers the inclusive interval `[start, end]`. When the end time is omitted it is taken to equal the start time, i.e. the cue block is the single instant `[start, start]` — for example, the timestamp of a `<frame>` or a point annotation.
-- an optional `<frame>` — a still image of the recording at this cue, shaped like a [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
-- an optional `<audio>` — an audio clip for this cue, with the same shape as `<frame>`.
+- an optional `<chapter>` — a chapter or section title (see [Chapters](#chapters) below), handled like [`<text>`](#text): it may carry its own element head and inline [formatting](#formatting).
+- an optional `<frame>` — the still image of the recording at the cue block's start time, shaped like a [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src). A point sample; valid on any cue block.
+- an optional `<audio>` — the recording over the cue block's interval `[start, end]`, with the same shape as `<frame>`. It is a temporal crop of the track's audio, the way a [`<picture>`](#picture) crop corresponds to its page region; the timestamps are authoritative and the clip is a best-effort fragment. Requires the cue block to carry an end time.
 - an optional **transcript**: a sequence of speaker turns. A turn is an optional `<voice>` (the speaker attribution, which may itself be styled) followed by the spoken text with inline [formatting](#formatting). When `<voice>` is omitted the turn belongs to an undefined speaker; a turn runs until the next `<voice>` or the end of the cue block.
 
 Minimal cue block (start time and one line of text):
@@ -1611,13 +1612,41 @@ Crossing the hour mark, and consecutive turns with no speaker attribution:
 </track>
 ```
 
+#### Chapters
+
+A cue block may carry a `<chapter>` — a chapter or section title — placed just after its timestamps (before any `<frame>`). A `<chapter>` **marks a boundary at its cue block's start time and nothing else**: the chapter runs from that instant until the next cue block that carries a `<chapter>` (or `</track>`). The cue block's own end time bounds its transcript and audio, not the chapter. The stretch before the first `<chapter>` is unchaptered.
+
+Chapters therefore form a **flat partition** of the timeline: no nesting, no overlap, no explicit chapter end. "Which chapter is active at time *T*?" is answered by the last `<chapter>` at or before *T*.
+
+```xml
+<track>
+  <bdiv/>
+  <minutes value="0"/><seconds value="0"/>
+  <chapter>Introduction</chapter>
+  Welcome, everyone.
+  <bdiv/>
+  <minutes value="0"/><seconds value="40"/>
+  Still in the introduction; this cue block starts no chapter.
+  <bdiv/>
+  <minutes value="1"/><seconds value="30"/>
+  <chapter><italic>Part 1</italic> — Background</chapter>
+  Let's start with some history.
+</track>
+```
+
+Because only the start time counts, a chapter boundary may fall inside an earlier, still-open cue block. Given a cue block with `<chapter>A</chapter>` starting at `01:00` and one with `<chapter>B</chapter>` starting at `01:15`, chapter A is `[01:00, 01:15)` and B begins at `01:15` — even if A's cue block carries transcript out to `01:30`.
+
+Chapters MUST begin at strictly increasing times — two chapters cannot mark the same instant. A `<chapter>` has no attributes in this version; nesting would be a future `level` attribute.
+
 Notes:
 
 - A non-empty `<track>` body must begin with a `<bdiv/>`; there must be no text before the first cue block, nor between a `<bdiv/>` and its start time.
 - Every timestamp run carries at least `<minutes>` and `<seconds>`; an end time, when present, must not be earlier than the start time. Cue-block intervals are inclusive of both endpoints; a missing end time means the interval `[start, start]`.
 - Cue blocks appear in non-decreasing order of start time. They may still overlap — for example, two speakers talking at once. When two cue blocks share a start time, their relative order is not further constrained (end times are not used as a tie-breaker).
+- A `<frame>` is the still at the cue block's start time. An `<audio>` clip is the recording over `[start, end]`, so a cue block with an `<audio>` must have an end time. Its duration is expected to correspond to `end − start`, but small differences from codec framing and encoder padding are normal and not significant; the timestamps, not the clip, are authoritative, and DocLang does not decode media to check this.
+- A `<chapter>`, when present, comes after the timestamps and before any `<frame>`. It defines a chapter boundary at the cue block's start time only — see [Chapters](#chapters).
 - `<msecs value="…"/>` accepts any integer in `[0, 999]`.
-- `<bdiv>`, `<frame>`, `<audio>`, `<voice>`, and the timestamp elements are only meaningful inside a `<track>`.
+- `<bdiv>`, `<chapter>`, `<frame>`, `<audio>`, `<voice>`, and the timestamp elements are only meaningful inside a `<track>`.
 
 ### Split structure
 
@@ -2590,7 +2619,7 @@ None
 
 ##### `<frame>`
 
-A still image of the recording at a [`<track>`](#track) cue block. Shaped like [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
+The still image of the recording at a [`<track>`](#track) cue block's start time. Shaped like [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
 
 ###### Allowed Context
 
@@ -2610,7 +2639,7 @@ None
 
 ##### `<audio>`
 
-An audio clip for a [`<track>`](#track) cue block. Same shape as [`<frame>`](#frame): an optional element head followed by an optional [`<src>`](#src).
+The recording over a [`<track>`](#track) cue block's interval `[start, end]` — a temporal crop of the track's audio, as a [`<picture>`](#picture) crop corresponds to its page region. Requires the cue block to carry an end time; the timestamps are authoritative and the clip is a best-effort fragment. Same shape as [`<frame>`](#frame).
 
 ###### Allowed Context
 
@@ -2648,6 +2677,26 @@ None
 | Raw text | Allowed |
 | Primary semantic elements | Allowed |
 
+##### `<chapter>`
+
+A chapter or section title for a [`<track>`](#track). It marks a chapter boundary at the start time of the cue block that carries it; the chapter runs until the next [`<chapter>`](#chapter) (or `</track>`), and the region before the first [`<chapter>`](#chapter) is unchaptered. Only the start time matters — the cue block's end time bounds its transcript, not the chapter. Chapters form a flat partition (no nesting, no overlap). Handled like [`<text>`](#text) (may carry its own element head and inline formatting).
+
+###### Allowed Context
+
+Can only appear inside a [`<track>`](#track) cue block, after the start (and optional end) timestamp and before any [`<frame>`](#frame).
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Allowed |
+| Primary semantic elements | Allowed |
+
 #### Property Elements
 
 *Property elements* are non-semantic elements that help define useful traits of a semantic element, forming the main building blocks of the [element head](#element-head). Property elements that can appear on the top level of the element head are called *primary*, while those that can only appear within other property elements are called *secondary*. The various property elements are further specified in the following subsections.
@@ -3609,6 +3658,8 @@ The token vocabulary trades off size and inference cost:
 | `</audio>` | [`audio`](#audio) end |
 | `<voice>` | [`voice`](#voice) start |
 | `</voice>` | [`voice`](#voice) end |
+| `<chapter>` | [`chapter`](#chapter) start |
+| `</chapter>` | [`chapter`](#chapter) end |
 | `<hours value="` | [`hours`](#hours) with `value` attribute start (out-of-range values) |
 | `<minutes value="` | [`minutes`](#minutes) with `value` attribute start (out-of-range values) |
 | `<seconds value="` | [`seconds`](#seconds) with `value` attribute start (out-of-range values) |
diff --git a/tests/data/invalid/nok_track_audio_without_end.dclg b/tests/data/invalid/nok_track_audio_without_end.dclg
new file mode 100644
index 0000000..6cfa332
--- /dev/null
+++ b/tests/data/invalid/nok_track_audio_without_end.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <audio> spans [start, end]; the cue block therefore needs an end time -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="4"/>
+    <audio><src uri="assets/clips/00-04.opus"/></audio>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_chapter_after_frame.dclg b/tests/data/invalid/nok_track_chapter_after_frame.dclg
new file mode 100644
index 0000000..f858f9f
--- /dev/null
+++ b/tests/data/invalid/nok_track_chapter_after_frame.dclg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <chapter> must precede <frame> -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <frame><src uri="assets/frames/00-00.jpg"/></frame>
+    <chapter>Too late</chapter>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_chapter_before_timestamp.dclg b/tests/data/invalid/nok_track_chapter_before_timestamp.dclg
new file mode 100644
index 0000000..6cc77ee
--- /dev/null
+++ b/tests/data/invalid/nok_track_chapter_before_timestamp.dclg
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <chapter> must come after the timestamps, not before -->
+  <track>
+    <bdiv/>
+    <chapter>Too early</chapter>
+    <minutes value="0"/><seconds value="0"/>
+    x
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_two_chapters_same_start.dclg b/tests/data/invalid/nok_track_two_chapters_same_start.dclg
new file mode 100644
index 0000000..a4e12f1
--- /dev/null
+++ b/tests/data/invalid/nok_track_two_chapters_same_start.dclg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a chapter boundary is a single instant: two chapters cannot share a start time -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="5"/>
+    <chapter>A</chapter>
+    first
+    <bdiv/>
+    <hours value="0"/><minutes value="0"/><seconds value="5"/>
+    <chapter>B</chapter>
+    same instant
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_chapter_boundary_mid_cue.dclg b/tests/data/valid/ok_track_chapter_boundary_mid_cue.dclg
new file mode 100644
index 0000000..9b64ce2
--- /dev/null
+++ b/tests/data/valid/ok_track_chapter_boundary_mid_cue.dclg
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- chapter B's boundary (01:15) falls inside chapter A's still-open cue block (ends 01:30) -->
+  <track>
+    <bdiv/>
+    <minutes value="1"/><seconds value="0"/>
+    <minutes value="1"/><seconds value="30"/>
+    <chapter>A</chapter>
+    A's content runs to 1:30.
+    <bdiv/>
+    <minutes value="1"/><seconds value="15"/>
+    <minutes value="1"/><seconds value="45"/>
+    <chapter>B</chapter>
+    B begins at 1:15 regardless.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_chapter_element_head.dclg b/tests/data/valid/ok_track_chapter_element_head.dclg
new file mode 100644
index 0000000..741eeb6
--- /dev/null
+++ b/tests/data/valid/ok_track_chapter_element_head.dclg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a <chapter> may carry its own element head (e.g. where the chapter title renders) -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <chapter>
+      <location value="20"/><location value="20"/><location value="300"/><location value="60"/>
+      Act I
+    </chapter>
+    Curtain up.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_chapters.dclg b/tests/data/valid/ok_track_chapters.dclg
new file mode 100644
index 0000000..6fa2dcf
--- /dev/null
+++ b/tests/data/valid/ok_track_chapters.dclg
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <chapter> follows the timestamps; marks a boundary at the cue block's start time -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    Cold open, no chapter yet.
+    <bdiv/>
+    <minutes value="0"/><seconds value="20"/>
+    <chapter>Introduction</chapter>
+    Welcome, everyone.
+    <bdiv/>
+    <minutes value="0"/><seconds value="50"/>
+    Still the introduction; this cue block starts no chapter.
+    <bdiv/>
+    <minutes value="1"/><seconds value="30"/>
+    <chapter><italic>Part 1</italic> — Background</chapter>
+    Let's start with some history.
+  </track>
+</doclang>

From 13e264593344b2dabb42e661151c68409e388d73 Mon Sep 17 00:00:00 2001
From: Panos Vagenas <pva@zurich.ibm.com>
Date: Thu, 3 Sep 2026 14:37:37 +0200
Subject: [PATCH 3/5] add track `<cover>`; make timestamp `<minutes>` optional

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
---
 doclang/doclang.sch                           |  63 +++++++++---------
 doclang/doclang.xsd                           |  14 ++--
 doclang/tokenization.py                       |   2 +
 reference/input/reference.xlsx                | Bin 16827 -> 16937 bytes
 spec.md                                       |  42 +++++++++---
 .../invalid/nok_track_cover_after_bdiv.dclg   |   9 +++
 tests/data/invalid/nok_track_two_covers.dclg  |  11 +++
 tests/data/valid/ok_track_cover.dclg          |  15 +++++
 .../data/valid/ok_track_mixed_unit_runs.dclg  |  13 ++++
 tests/data/valid/ok_track_seconds_only.dclg   |  14 ++++
 10 files changed, 139 insertions(+), 44 deletions(-)
 create mode 100644 tests/data/invalid/nok_track_cover_after_bdiv.dclg
 create mode 100644 tests/data/invalid/nok_track_two_covers.dclg
 create mode 100644 tests/data/valid/ok_track_cover.dclg
 create mode 100644 tests/data/valid/ok_track_mixed_unit_runs.dclg
 create mode 100644 tests/data/valid/ok_track_seconds_only.dclg

diff --git a/doclang/doclang.sch b/doclang/doclang.sch
index 665f30d..fa76aee 100644
--- a/doclang/doclang.sch
+++ b/doclang/doclang.sch
@@ -36,8 +36,8 @@
       <sch:let name="first-non-header" value="*[not(self::dl:label or self::dl:thread or self::dl:xref or self::dl:href or self::dl:layer or self::dl:location or self::dl:caption or self::dl:description or self::dl:summary or self::dl:custom)][1]"/>
       <sch:let name="text-before-first-bdiv" value="text()[following-sibling::dl:bdiv and not(preceding-sibling::dl:bdiv)][normalize-space(.) != '']"/>
 
-      <sch:assert test="not($first-non-header) or $first-non-header[self::dl:bdiv]">
-        Track must have bdiv as first element after optional element head (property elements: label, thread, xref, href, layer, location, caption, description, summary, custom).
+      <sch:assert test="not($first-non-header) or $first-non-header[self::dl:cover or self::dl:bdiv]">
+        Track must have bdiv (optionally preceded by a single cover) as first element after the optional element head (property elements: label, thread, xref, href, layer, location, caption, description, summary, custom).
         Found: <sch:value-of select="if ($first-non-header) then name($first-non-header) else 'nothing'"/>
       </sch:assert>
 
@@ -101,7 +101,7 @@
     <sch:rule context="dl:text | dl:heading | dl:code | dl:formula | dl:caption | dl:description | dl:summary |
                        dl:page_header | dl:page_footer | dl:footnote | dl:picture | dl:marker |
                        dl:field_region | dl:field_heading | dl:field_item | dl:key | dl:value |
-                       dl:list | dl:table | dl:index | dl:group | dl:track | dl:voice | dl:chapter | dl:frame | dl:audio">
+                       dl:list | dl:table | dl:index | dl:group | dl:track | dl:voice | dl:chapter | dl:cover | dl:frame | dl:audio">
       <sch:let name="header-elements" value="dl:label | dl:thread | dl:xref | dl:href | dl:layer | dl:location | dl:caption | dl:description | dl:summary | dl:custom"/>
 
       <sch:let name="text-before-header" value="text()[following-sibling::*[self::dl:label or self::dl:thread or self::dl:xref or self::dl:href or self::dl:layer or self::dl:location or self::dl:caption or self::dl:description or self::dl:summary or self::dl:custom]]"/>
@@ -396,8 +396,8 @@
                                                          return $cue-content[$i][self::text()][normalize-space(.) != '']
                                                     else $cue-content[self::text()][normalize-space(.) != '']"/>
 
-      <sch:assert test="not($first-elem) or $first-elem[self::dl:hours or self::dl:minutes]">
-        A track cue block must begin with a start timestamp: its first element must be hours or minutes.
+      <sch:assert test="not($first-elem) or $first-elem[self::dl:hours or self::dl:minutes or self::dl:seconds]">
+        A track cue block must begin with a start timestamp: its first element must be hours, minutes or seconds.
         Found: <sch:value-of select="if ($first-elem) then name($first-elem) else 'nothing'"/>
       </sch:assert>
 
@@ -418,27 +418,28 @@
       <sch:let name="cue" value="if ($next-bdiv)
                                  then following-sibling::*[following-sibling::dl:bdiv[1] is $next-bdiv]
                                  else following-sibling::*"/>
-      <sch:let name="mins" value="$cue[self::dl:minutes]"/>
+      <!-- <seconds> is the per-run anchor (the only mandatory component) -->
+      <sch:let name="secs" value="$cue[self::dl:seconds]"/>
 
-      <sch:let name="m1" value="$mins[1]"/>
-      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="s1" value="$secs[1]"/>
+      <sch:let name="m1" value="$s1/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="h1" value="if ($m1) then $m1/preceding-sibling::*[1][self::dl:hours] else $s1/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
-                                      + 60000 * number($m1/@value)
+                                      + 60000 * (if ($m1) then number($m1/@value) else 0)
                                       + 1000 * number($s1/@value)
                                       + (if ($ms1) then number($ms1/@value) else 0)"/>
 
-      <sch:let name="m2" value="$mins[2]"/>
-      <sch:let name="h2" value="$m2/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="s2" value="$m2/following-sibling::dl:seconds[1]"/>
+      <sch:let name="s2" value="$secs[2]"/>
+      <sch:let name="m2" value="$s2/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="h2" value="if ($m2) then $m2/preceding-sibling::*[1][self::dl:hours] else $s2/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="ms2" value="$s2/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="end-ms" value="3600000 * (if ($h2) then number($h2/@value) else 0)
-                                    + 60000 * number($m2/@value)
+                                    + 60000 * (if ($m2) then number($m2/@value) else 0)
                                     + 1000 * number($s2/@value)
                                     + (if ($ms2) then number($ms2/@value) else 0)"/>
 
-      <sch:assert test="count($mins) != 2 or $end-ms ge $start-ms">
+      <sch:assert test="count($secs) != 2 or $end-ms ge $start-ms">
         A track cue block end timestamp must not be earlier than its start timestamp.
         Found start=<sch:value-of select="$start-ms"/>ms, end=<sch:value-of select="$end-ms"/>ms.
       </sch:assert>
@@ -454,21 +455,21 @@
     <sch:rule context="dl:track/dl:bdiv[preceding-sibling::dl:bdiv]">
       <sch:let name="prev-bdiv" value="preceding-sibling::dl:bdiv[1]"/>
 
-      <sch:let name="m1" value="following-sibling::dl:minutes[1]"/>
-      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="s1" value="following-sibling::dl:seconds[1]"/>
+      <sch:let name="m1" value="$s1/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="h1" value="if ($m1) then $m1/preceding-sibling::*[1][self::dl:hours] else $s1/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
-                                      + 60000 * number($m1/@value)
+                                      + 60000 * (if ($m1) then number($m1/@value) else 0)
                                       + 1000 * number($s1/@value)
                                       + (if ($ms1) then number($ms1/@value) else 0)"/>
 
-      <sch:let name="pm1" value="$prev-bdiv/following-sibling::dl:minutes[1]"/>
-      <sch:let name="ph1" value="$pm1/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="ps1" value="$pm1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ps1" value="$prev-bdiv/following-sibling::dl:seconds[1]"/>
+      <sch:let name="pm1" value="$ps1/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="ph1" value="if ($pm1) then $pm1/preceding-sibling::*[1][self::dl:hours] else $ps1/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="pms1" value="$ps1/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="prev-start-ms" value="3600000 * (if ($ph1) then number($ph1/@value) else 0)
-                                           + 60000 * number($pm1/@value)
+                                           + 60000 * (if ($pm1) then number($pm1/@value) else 0)
                                            + 1000 * number($ps1/@value)
                                            + (if ($pms1) then number($pms1/@value) else 0)"/>
 
@@ -487,21 +488,21 @@
   <sch:pattern id="track-chapter-strictly-increasing">
     <sch:rule context="dl:track/dl:chapter[preceding-sibling::dl:chapter]">
       <!-- start time of the cue block this <chapter> belongs to (first timestamp run after its <bdiv>) -->
-      <sch:let name="m1" value="preceding-sibling::dl:bdiv[1]/following-sibling::dl:minutes[1]"/>
-      <sch:let name="h1" value="$m1/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="s1" value="$m1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="s1" value="preceding-sibling::dl:bdiv[1]/following-sibling::dl:seconds[1]"/>
+      <sch:let name="m1" value="$s1/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="h1" value="if ($m1) then $m1/preceding-sibling::*[1][self::dl:hours] else $s1/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="ms1" value="$s1/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="start-ms" value="3600000 * (if ($h1) then number($h1/@value) else 0)
-                                      + 60000 * number($m1/@value)
+                                      + 60000 * (if ($m1) then number($m1/@value) else 0)
                                       + 1000 * number($s1/@value)
                                       + (if ($ms1) then number($ms1/@value) else 0)"/>
 
-      <sch:let name="pm1" value="preceding-sibling::dl:chapter[1]/preceding-sibling::dl:bdiv[1]/following-sibling::dl:minutes[1]"/>
-      <sch:let name="ph1" value="$pm1/preceding-sibling::*[1][self::dl:hours]"/>
-      <sch:let name="ps1" value="$pm1/following-sibling::dl:seconds[1]"/>
+      <sch:let name="ps1" value="preceding-sibling::dl:chapter[1]/preceding-sibling::dl:bdiv[1]/following-sibling::dl:seconds[1]"/>
+      <sch:let name="pm1" value="$ps1/preceding-sibling::*[1][self::dl:minutes]"/>
+      <sch:let name="ph1" value="if ($pm1) then $pm1/preceding-sibling::*[1][self::dl:hours] else $ps1/preceding-sibling::*[1][self::dl:hours]"/>
       <sch:let name="pms1" value="$ps1/following-sibling::*[1][self::dl:msecs]"/>
       <sch:let name="prev-start-ms" value="3600000 * (if ($ph1) then number($ph1/@value) else 0)
-                                           + 60000 * number($pm1/@value)
+                                           + 60000 * (if ($pm1) then number($pm1/@value) else 0)
                                            + 1000 * number($ps1/@value)
                                            + (if ($pms1) then number($pms1/@value) else 0)"/>
 
diff --git a/doclang/doclang.xsd b/doclang/doclang.xsd
index 2b35836..a04e3c7 100644
--- a/doclang/doclang.xsd
+++ b/doclang/doclang.xsd
@@ -738,11 +738,13 @@
     </xs:complexType>
   </xs:element>
 
-  <!-- Timestamp run: hours? minutes seconds msecs? (hours/msecs default to 0 when omitted) -->
+  <!-- Timestamp run: hours? minutes? seconds msecs? -->
+  <!-- Only <seconds> is mandatory; hours, minutes and msecs default to 0 when omitted. -->
+  <!-- <seconds> is the per-run anchor: consecutive runs stay deterministically separable. -->
   <xs:group name="timestamp">
     <xs:sequence>
       <xs:element ref="dl:hours" minOccurs="0"/>
-      <xs:element ref="dl:minutes"/>
+      <xs:element ref="dl:minutes" minOccurs="0"/>
       <xs:element ref="dl:seconds"/>
       <xs:element ref="dl:msecs" minOccurs="0"/>
     </xs:sequence>
@@ -762,6 +764,9 @@
   <xs:element name="frame" type="dl:media_capture_type"/>
   <xs:element name="audio" type="dl:media_capture_type"/>
 
+  <!-- COVER: whole-track representative image (before the first cue block); same shape as frame -->
+  <xs:element name="cover" type="dl:media_capture_type"/>
+
   <!-- VOICE ELEMENT: speaker attribution; same content model as <text> -->
   <xs:element name="voice" type="dl:component_with_semantic_seq"/>
 
@@ -791,14 +796,15 @@
     </xs:sequence>
   </xs:group>
 
-  <!-- TRACK ELEMENT: optional element_head + track_cue_block* -->
+  <!-- TRACK ELEMENT: optional element_head + optional cover + track_cue_block* -->
   <!-- Semantic element: may optionally begin with element_head (per spec.md) -->
   <!-- mixed: a literal newline between consecutive unattributed transcript turns is allowed -->
-  <!-- Schematron enforces: must start with bdiv (after optional track-level element head) -->
+  <!-- Schematron enforces: first cue block is a bdiv (after the optional element head and cover) -->
   <xs:element name="track">
     <xs:complexType mixed="true">
       <xs:sequence>
         <xs:group ref="dl:element_head"/>
+        <xs:element ref="dl:cover" minOccurs="0"/>
         <xs:group ref="dl:track_cue_block" minOccurs="0" maxOccurs="unbounded"/>
       </xs:sequence>
     </xs:complexType>
diff --git a/doclang/tokenization.py b/doclang/tokenization.py
index 4abd5bb..99ccd56 100644
--- a/doclang/tokenization.py
+++ b/doclang/tokenization.py
@@ -108,6 +108,8 @@
     "<track>",
     "</track>",
     "<bdiv/>",
+    "<cover>",
+    "</cover>",
     "<frame>",
     "</frame>",
     "<audio>",
diff --git a/reference/input/reference.xlsx b/reference/input/reference.xlsx
index 4057b87a84a3a71ed9038f6ee0ca047b7bad36c6..6041e5ab8cb741fc4b8b8d61b0abc9bba60601be 100644
GIT binary patch
delta 9015
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diff --git a/spec.md b/spec.md
index c4bdbb8..47fbe68 100644
--- a/spec.md
+++ b/spec.md
@@ -1551,23 +1551,25 @@ Detailed examples can be seen here: [Form Examples](/examples/form/form-examples
 
 A `<track>` captures a time-aligned media transcript — subtitles, captions, or diarized speech associated with an audio or video recording. It is a [semantic element](#semantic-elements) and may begin with an [element head](#element-head).
 
-The body of a `<track>` is a sequence of *cue blocks*. Each cue block is introduced by a `<bdiv/>` delimiter (analogous to `<ldiv/>` for lists): a non-empty `<track>` body must begin with a `<bdiv/>`, and a cue block spans everything between two sibling `<bdiv/>` elements (or until `</track>`).
+The body of a `<track>` may begin with a single `<cover>` — a representative image for the track as a whole (podcast artwork, a poster, a title card). It has the same shape as `<frame>` (an optional element head followed by an optional [`<src>`](#src)).
+
+The rest of the body is a sequence of *cue blocks*. Each cue block is introduced by a `<bdiv/>` delimiter (analogous to `<ldiv/>` for lists): the first cue block must be a `<bdiv/>`, and a cue block spans everything between two sibling `<bdiv/>` elements (or until `</track>`).
 
 A cue block consists of, in order:
 
-- a **start time** (mandatory): a run of `<hours value="H"/>` (optional), `<minutes value="M"/>`, `<seconds value="S"/>`, `<msecs value="MS"/>` (optional). `<minutes>` and `<seconds>` are always present; `<hours>` and `<msecs>` default to `0` when omitted.
+- a **start time** (mandatory): a run of `<hours value="H"/>`, `<minutes value="M"/>`, `<seconds value="S"/>`, `<msecs value="MS"/>` in that order. Only `<seconds>` is required; `<hours>`, `<minutes>` and `<msecs>` each default to `0` when omitted. `<seconds>` anchors the run, so two consecutive runs stay unambiguous.
 - an **end time** (optional): the same run shape, immediately following the start time. A cue block covers the inclusive interval `[start, end]`. When the end time is omitted it is taken to equal the start time, i.e. the cue block is the single instant `[start, start]` — for example, the timestamp of a `<frame>` or a point annotation.
 - an optional `<chapter>` — a chapter or section title (see [Chapters](#chapters) below), handled like [`<text>`](#text): it may carry its own element head and inline [formatting](#formatting).
-- an optional `<frame>` — the still image of the recording at the cue block's start time, shaped like a [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src). A point sample; valid on any cue block.
+- an optional `<frame>` — a still image for the cue block's start time, with an optional element head and an optional [`<src>`](#src). Typically a video frame, but equally a slide, a keyframe, or any representative still for that moment. A point sample; valid on any cue block. (For a track-wide image, use `<cover>` instead.)
 - an optional `<audio>` — the recording over the cue block's interval `[start, end]`, with the same shape as `<frame>`. It is a temporal crop of the track's audio, the way a [`<picture>`](#picture) crop corresponds to its page region; the timestamps are authoritative and the clip is a best-effort fragment. Requires the cue block to carry an end time.
 - an optional **transcript**: a sequence of speaker turns. A turn is an optional `<voice>` (the speaker attribution, which may itself be styled) followed by the spoken text with inline [formatting](#formatting). When `<voice>` is omitted the turn belongs to an undefined speaker; a turn runs until the next `<voice>` or the end of the cue block.
 
-Minimal cue block (start time and one line of text):
+Minimal cue block (start time and one line of text) — `<hours>`, `<minutes>` and `<msecs>` omitted:
 
 ```xml
 <track>
   <bdiv/>
-  <minutes value="0"/><seconds value="2"/>
+  <seconds value="2"/>
   Hello, and welcome.
 </track>
 ```
@@ -1640,13 +1642,13 @@ Chapters MUST begin at strictly increasing times — two chapters cannot mark th
 
 Notes:
 
-- A non-empty `<track>` body must begin with a `<bdiv/>`; there must be no text before the first cue block, nor between a `<bdiv/>` and its start time.
-- Every timestamp run carries at least `<minutes>` and `<seconds>`; an end time, when present, must not be earlier than the start time. Cue-block intervals are inclusive of both endpoints; a missing end time means the interval `[start, start]`.
+- A `<track>` body may open with one `<cover>` (a track-wide image); the first cue block, and every non-empty `<track>` body, then begins with a `<bdiv/>`. There must be no text before the first cue block, nor between a `<bdiv/>` and its start time.
+- Every timestamp run carries `<seconds>` (the only required component); an end time, when present, must not be earlier than the start time. Cue-block intervals are inclusive of both endpoints; a missing end time means the interval `[start, start]`.
 - Cue blocks appear in non-decreasing order of start time. They may still overlap — for example, two speakers talking at once. When two cue blocks share a start time, their relative order is not further constrained (end times are not used as a tie-breaker).
 - A `<frame>` is the still at the cue block's start time. An `<audio>` clip is the recording over `[start, end]`, so a cue block with an `<audio>` must have an end time. Its duration is expected to correspond to `end − start`, but small differences from codec framing and encoder padding are normal and not significant; the timestamps, not the clip, are authoritative, and DocLang does not decode media to check this.
 - A `<chapter>`, when present, comes after the timestamps and before any `<frame>`. It defines a chapter boundary at the cue block's start time only — see [Chapters](#chapters).
 - `<msecs value="…"/>` accepts any integer in `[0, 999]`.
-- `<bdiv>`, `<chapter>`, `<frame>`, `<audio>`, `<voice>`, and the timestamp elements are only meaningful inside a `<track>`.
+- `<cover>`, `<bdiv>`, `<chapter>`, `<frame>`, `<audio>`, `<voice>`, and the timestamp elements are only meaningful inside a `<track>`.
 
 ### Split structure
 
@@ -2617,6 +2619,26 @@ None
 </doclang>
 ```
 
+##### `<cover>`
+
+A representative image for a [`<track>`](#track) as a whole — podcast artwork, a poster, a title card. Appears once, before the first cue block. Same shape as [`<frame>`](#frame): an optional element head followed by an optional [`<src>`](#src).
+
+###### Allowed Context
+
+Can only appear inside a [`<track>`](#track), before the first [`<bdiv>`](#bdiv).
+
+###### Attributes
+
+None
+
+###### Allowed Content Types
+
+| Content Type | Allowed / Not allowed |
+| --- | --- |
+| Element head | Allowed |
+| Raw text | Not allowed |
+| Primary semantic elements | Allowed |
+
 ##### `<frame>`
 
 The still image of the recording at a [`<track>`](#track) cue block's start time. Shaped like [`<picture>`](#picture): an optional element head followed by an optional [`<src>`](#src).
@@ -2974,7 +2996,7 @@ None (empty element).
 
 ##### `<minutes>`
 
-Minutes component of a [`<track>`](#track) cue timestamp.
+Minutes component of a [`<track>`](#track) cue timestamp. Optional within a timestamp run (defaults to 0).
 
 ###### Allowed Context
 
@@ -3652,6 +3674,8 @@ The token vocabulary trades off size and inference cost:
 | `<track>` | [`track`](#track) start |
 | `</track>` | [`track`](#track) end |
 | `<bdiv/>` | [`bdiv`](#bdiv) cue-block delimiter |
+| `<cover>` | [`cover`](#cover) start |
+| `</cover>` | [`cover`](#cover) end |
 | `<frame>` | [`frame`](#frame) start |
 | `</frame>` | [`frame`](#frame) end |
 | `<audio>` | [`audio`](#audio) start |
diff --git a/tests/data/invalid/nok_track_cover_after_bdiv.dclg b/tests/data/invalid/nok_track_cover_after_bdiv.dclg
new file mode 100644
index 0000000..cfedf2b
--- /dev/null
+++ b/tests/data/invalid/nok_track_cover_after_bdiv.dclg
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <cover> must come before the first cue block, not inside one -->
+  <track>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <cover><src uri="assets/cover.png"/></cover>
+  </track>
+</doclang>
diff --git a/tests/data/invalid/nok_track_two_covers.dclg b/tests/data/invalid/nok_track_two_covers.dclg
new file mode 100644
index 0000000..661e01c
--- /dev/null
+++ b/tests/data/invalid/nok_track_two_covers.dclg
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- at most one <cover> per track -->
+  <track>
+    <cover><src uri="a.png"/></cover>
+    <cover><src uri="b.png"/></cover>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    x
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_cover.dclg b/tests/data/valid/ok_track_cover.dclg
new file mode 100644
index 0000000..3d9e7be
--- /dev/null
+++ b/tests/data/valid/ok_track_cover.dclg
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- a track-wide <cover> image, before the first cue block -->
+  <track>
+    <label value="podcast"/>
+    <cover>
+      <caption>Episode 12 artwork</caption>
+      <src uri="assets/cover.png"/>
+    </cover>
+    <bdiv/>
+    <minutes value="0"/><seconds value="0"/>
+    <voice>Host</voice>
+    Welcome back to the show.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_mixed_unit_runs.dclg b/tests/data/valid/ok_track_mixed_unit_runs.dclg
new file mode 100644
index 0000000..e13f535
--- /dev/null
+++ b/tests/data/valid/ok_track_mixed_unit_runs.dclg
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- terse early cues, fuller runs once past the minute mark -->
+  <track>
+    <bdiv/>
+    <seconds value="55"/>
+    still under a minute
+    <bdiv/>
+    <minutes value="1"/><seconds value="3"/>
+    <minutes value="1"/><seconds value="8"/>
+    now with minutes
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_seconds_only.dclg b/tests/data/valid/ok_track_seconds_only.dclg
new file mode 100644
index 0000000..c49a0b8
--- /dev/null
+++ b/tests/data/valid/ok_track_seconds_only.dclg
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- only <seconds> is required; hours/minutes/msecs omitted -->
+  <track>
+    <bdiv/>
+    <seconds value="2"/>
+    Hello, and welcome.
+    <bdiv/>
+    <seconds value="9"/><msecs value="250"/>
+    <seconds value="14"/>
+    <voice>Host</voice>
+    Let's get started.
+  </track>
+</doclang>

From c31fea6ec1bfff43b8fa1240bfd4d35609c00bb6 Mon Sep 17 00:00:00 2001
From: Panos Vagenas <pva@zurich.ibm.com>
Date: Wed, 9 Sep 2026 10:28:38 +0200
Subject: [PATCH 4/5] minor spec updates

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
---
 reference/input/reference.xlsx | Bin 16937 -> 16994 bytes
 spec.md                        |  19 ++++++++++++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

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diff --git a/spec.md b/spec.md
index 47fbe68..828e276 100644
--- a/spec.md
+++ b/spec.md
@@ -1614,6 +1614,19 @@ Crossing the hour mark, and consecutive turns with no speaker attribution:
 </track>
 ```
 
+The kind of a track —for example whether it is audio-only or video— is not modelled explicitly. A producer that wants to record it may do so informally with a [`<label>`](#label) in the track's element head (`audio`, `video`, `podcast`, `screencast` etc.); label values are open and not validated. For instance:
+
+```xml
+<track>
+  <label value="audio"/>
+  <bdiv/>
+  <seconds value="0"/>
+  <seconds value="2"/>
+  <voice>Host</voice>
+  Welcome back to the show.
+</track>
+```
+
 #### Chapters
 
 A cue block may carry a `<chapter>` — a chapter or section title — placed just after its timestamps (before any `<frame>`). A `<chapter>` **marks a boundary at its cue block's start time and nothing else**: the chapter runs from that instant until the next cue block that carries a `<chapter>` (or `</track>`). The cue block's own end time bounds its transcript and audio, not the chapter. The stretch before the first `<chapter>` is unchaptered.
@@ -2580,7 +2593,7 @@ None
 
 ##### `<track>`
 
-Captures a time-aligned media transcript (subtitles, captions, or diarized speech). The body is a sequence of cue blocks, each introduced by a [`<bdiv>`](#bdiv) delimiter; a non-empty [`<track>`](#track) body must begin with a [`<bdiv>`](#bdiv). A cue block carries a mandatory start time, an optional end time (each a run of [`<hours>`](#hours)/[`<minutes>`](#minutes)/[`<seconds>`](#seconds)/[`<msecs>`](#msecs)), an optional [`<frame>`](#frame), an optional [`<audio>`](#audio), and an optional transcript of [`<voice>`](#voice)-attributed turns.
+Captures a time-aligned media transcript (subtitles, captions, or diarized speech). The body may open with a single [`<cover>`](#cover) (a track-wide image), then a sequence of cue blocks, each introduced by a [`<bdiv>`](#bdiv) delimiter; a non-empty [`<track>`](#track) body must begin with a [`<cover>`](#cover) or a [`<bdiv>`](#bdiv). A cue block carries a mandatory start time, an optional end time (each a run of [`<hours>`](#hours)/[`<minutes>`](#minutes)/[`<seconds>`](#seconds)/[`<msecs>`](#msecs)), an optional [`<chapter>`](#chapter), an optional [`<frame>`](#frame), an optional [`<audio>`](#audio), and an optional transcript of [`<voice>`](#voice)-attributed turns.
 
 ###### Allowed Context
 
@@ -2596,7 +2609,7 @@ None
 | --- | --- |
 | Element head | Allowed |
 | Raw text | Only within a cue block transcript |
-| Primary semantic elements | Only [`<frame>`](#frame), [`<audio>`](#audio), and [`<voice>`](#voice), within cue blocks |
+| Primary semantic elements | [`<cover>`](#cover) before the first cue block; within cue blocks, [`<chapter>`](#chapter), [`<frame>`](#frame), [`<audio>`](#audio), and [`<voice>`](#voice) |
 
 ###### Example
 
@@ -2621,7 +2634,7 @@ None
 
 ##### `<cover>`
 
-A representative image for a [`<track>`](#track) as a whole — podcast artwork, a poster, a title card. Appears once, before the first cue block. Same shape as [`<frame>`](#frame): an optional element head followed by an optional [`<src>`](#src).
+A representative image for a [`<track>`](#track) as a whole — for example podcast artwork, a poster, or a title card. Appears once, before the first cue block. Same shape as [`<frame>`](#frame): an optional element head followed by an optional [`<src>`](#src).
 
 ###### Allowed Context
 

From a5616e7725a79c5d071d70519e63b4fe28cadc0f Mon Sep 17 00:00:00 2001
From: Panos Vagenas <pva@zurich.ibm.com>
Date: Thu, 10 Sep 2026 16:20:17 +0200
Subject: [PATCH 5/5] fix audio end-time check, widen hours tokens, refine
 <voice> semantics

Signed-off-by: Panos Vagenas <pva@zurich.ibm.com>
---
 doclang/doclang.sch                                  |  2 +-
 doclang/tokenization.py                              |  4 ++--
 spec.md                                              |  4 ++--
 .../data/valid/ok_track_audio_seconds_only_runs.dclg | 12 ++++++++++++
 tests/data/valid/ok_track_voices.dclg                |  4 ++++
 5 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 tests/data/valid/ok_track_audio_seconds_only_runs.dclg

diff --git a/doclang/doclang.sch b/doclang/doclang.sch
index fa76aee..39a8f0a 100644
--- a/doclang/doclang.sch
+++ b/doclang/doclang.sch
@@ -524,7 +524,7 @@
                                  then following-sibling::*[following-sibling::dl:bdiv[1] is $next-bdiv]
                                  else following-sibling::*"/>
 
-      <sch:assert test="not($cue[self::dl:audio]) or count($cue[self::dl:minutes]) = 2">
+      <sch:assert test="not($cue[self::dl:audio]) or count($cue[self::dl:seconds]) = 2">
         A track cue block with an audio clip must carry an end time; the clip spans the cue block's interval [start, end].
       </sch:assert>
     </sch:rule>
diff --git a/doclang/tokenization.py b/doclang/tokenization.py
index 99ccd56..9e1e4cc 100644
--- a/doclang/tokenization.py
+++ b/doclang/tokenization.py
@@ -131,8 +131,8 @@ def _location_tokens(resolution: int) -> list[str]:
 
 
 def _hours_tokens() -> list[str]:
-    """Return concrete ``<hours value="N"/>`` tokens for ``N`` in ``[0, 10)``."""
-    return [f'<hours value="{value}"/>' for value in range(10)]
+    """Return concrete ``<hours value="N"/>`` tokens for ``N`` in ``[0, 24)``."""
+    return [f'<hours value="{value}"/>' for value in range(24)]
 
 
 def _minutes_tokens() -> list[str]:
diff --git a/spec.md b/spec.md
index 828e276..5f23677 100644
--- a/spec.md
+++ b/spec.md
@@ -1562,7 +1562,7 @@ A cue block consists of, in order:
 - an optional `<chapter>` — a chapter or section title (see [Chapters](#chapters) below), handled like [`<text>`](#text): it may carry its own element head and inline [formatting](#formatting).
 - an optional `<frame>` — a still image for the cue block's start time, with an optional element head and an optional [`<src>`](#src). Typically a video frame, but equally a slide, a keyframe, or any representative still for that moment. A point sample; valid on any cue block. (For a track-wide image, use `<cover>` instead.)
 - an optional `<audio>` — the recording over the cue block's interval `[start, end]`, with the same shape as `<frame>`. It is a temporal crop of the track's audio, the way a [`<picture>`](#picture) crop corresponds to its page region; the timestamps are authoritative and the clip is a best-effort fragment. Requires the cue block to carry an end time.
-- an optional **transcript**: a sequence of speaker turns. A turn is an optional `<voice>` (the speaker attribution, which may itself be styled) followed by the spoken text with inline [formatting](#formatting). When `<voice>` is omitted the turn belongs to an undefined speaker; a turn runs until the next `<voice>` or the end of the cue block.
+- an optional **transcript**: a sequence of speaker turns. A turn is an optional `<voice>` (the speaker attribution, which may itself be styled) followed by the spoken text with inline [formatting](#formatting); it runs until the next `<voice>` or the end of the cue block. An empty `<voice/>` ends the current speaker's turn — the text after it is unattributed. How unattributed text is interpreted — e.g. as an unknown speaker, no speaker (e.g. a sound description), continuation of the last named speaker, etc. — is application-defined.
 
 Minimal cue block (start time and one line of text) — `<hours>`, `<minutes>` and `<msecs>` omitted:
 
@@ -3702,7 +3702,7 @@ The token vocabulary trades off size and inference cost:
 | `<seconds value="` | [`seconds`](#seconds) with `value` attribute start (out-of-range values) |
 | `<msecs value="` | [`msecs`](#msecs) with `value` attribute start (out-of-range values) |
 | `<location value="0"/>`, `<location value="1"/>`, ..., `<location value="511"/>` | [`location`](#location) tokens with values from 0 to 511 |
-| `<hours value="0"/>`, `<hours value="1"/>`, ..., `<hours value="9"/>` | [`hours`](#hours) tokens with values from 0 to 9 |
+| `<hours value="0"/>`, `<hours value="1"/>`, ..., `<hours value="23"/>` | [`hours`](#hours) tokens with values from 0 to 23 |
 | `<minutes value="0"/>`, `<minutes value="1"/>`, ..., `<minutes value="59"/>` | [`minutes`](#minutes) tokens with values from 0 to 59 |
 | `<seconds value="0"/>`, `<seconds value="1"/>`, ..., `<seconds value="59"/>` | [`seconds`](#seconds) tokens with values from 0 to 59 |
 | `<msecs value="0"/>`, `<msecs value="10"/>`, ..., `<msecs value="990"/>` | [`msecs`](#msecs) tokens with values in multiples of 10 from 0 to 990 |
diff --git a/tests/data/valid/ok_track_audio_seconds_only_runs.dclg b/tests/data/valid/ok_track_audio_seconds_only_runs.dclg
new file mode 100644
index 0000000..d012aea
--- /dev/null
+++ b/tests/data/valid/ok_track_audio_seconds_only_runs.dclg
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<doclang xmlns="https://www.doclang.ai/ns/v0">
+  <!-- <audio> requires an end time; start+end may both be seconds-only runs -->
+  <track>
+    <bdiv/>
+    <seconds value="4"/>
+    <seconds value="9"/>
+    <audio><src uri="assets/clips/00-04.opus"/></audio>
+    <voice>Host</voice>
+    Recorded segment.
+  </track>
+</doclang>
diff --git a/tests/data/valid/ok_track_voices.dclg b/tests/data/valid/ok_track_voices.dclg
index 525cd21..34af195 100644
--- a/tests/data/valid/ok_track_voices.dclg
+++ b/tests/data/valid/ok_track_voices.dclg
@@ -12,5 +12,9 @@
     <minutes value="0"/><seconds value="9"/>
     First unattributed line.
     Second unattributed line.
+    <bdiv/>
+    <minutes value="0"/><seconds value="12"/>
+    <voice>Esme</voice>Hee!
+    <voice/><italic>laughter</italic>
   </track>
 </doclang>