open-standards/wai/pack-conformance/multi/multi-captions-01/package/policy.json
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wai.graphics.vector is registered, and graphics-vector §6 is written: packages and floors
SPEC §5 registers wai.graphics.vector as a payload of class StandardDefined,
lossless, standalone, royalty-free, with the registry's new media class
`graphics`. Its payload format, WVG1 with the WOS1 sets it names, is fixed.

graphics-vector §6 defines what a package reads of a document:

- §6.1 the window slice: a piece is the document with its window and its
  stated costs set and nothing else changed;
- §6.2 the document digest, the same for a document and every window slice of
  it; a package verifier refuses a component whose pieces differ
  (graphics-document-mismatch);
- §6.3 the text floor: a floor rung of wai.text.zstd, each piece's transcript
  in a Zstandard frame of raw blocks that has one encoding per content;
- §6.4 captions: blocks of purpose caption, subtitle and forced_narrative are
  held to a text component in their language whose cues carry the same strings
  over the same milliseconds (caption_without_track).

wai-vector computes each (package.rs; `document`, `slice`, `floor`,
`captions`), wai-pack writes and verifies them, and a graphics document with
caption blocks now packs beside the text components that carry them
(pack-caption-blocks is withdrawn). A packager reads the capability from the
registry, so a royalty-free package may carry it.

Conformance: vector-conformance gains the group `packages` (a document, its
three window slices, a second document), and pack-conformance/multi gains
multi-captions-01. tools/wai_vector_check.py and
pack-conformance/multi_verify.py recompute both; multi_verify.py plants four
faults that leave a piece consistent in every other respect, each found by its
own check and taken with that check left out, and tests/multi.rs plants the
same in sealed packages.

Co-Authored-By: Claude <[email protected]>
2026-11-10 17:29:14 -05:00

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