playlist and track publish byArtist and duration on types that do not define them

Found by WORK-628, which ran @adobe/structured-data-validator over the SEO baseline. These are the only schema.org-layer findings on today's baseline, and every one of them is real. The baseline never recorded them as defects: SPEC-130 D5 leaves a schema row to the reviewer, and the rows that carry these properties say in their own comments that nothing checks them.

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Relationships

ID:SPEC-130Status:shipped

Declarative schema.org mapping

ID:WORK-628Status:done

Spike: @adobe/structured-data-validator over the SEO baseline

Priority:mediumComplexity:simpleMilestone:v0.40.0

ID:v0.41.0Status:complete

v0.41.0 — Composed runes you can ship

ID:SPEC-145Status:accepted

Composed runes

ID:WORK-629Status:draft

Check the SEO baseline's types and properties against schema.org in CI

Priority:lowComplexity:simple

main current reported

claude/v040-sd-validator-spike reported claude/post-v0.38-roadmap-jb7pie reported main reported claude/v040-bug-032-sandbox-context confirmed

Steps to Reproduce

node scripts/sd-validator-spike.mjs (see the script header for the scratch install)
Read the [schema.org] warnings

Expected

Every property a row publishes is one schema.org defines for that row's type (its domainIncludes, inherited properties included).

Actual

Checked against schema.org 30.1:

byArtist on MusicPlaylist. playlist type="mix" uses musicRow('MusicPlaylist'), whose container map carries artist: 'byArtist'. byArtist's domain is MusicAlbum and MusicRecording only. The album row is fine because it is a MusicAlbum. Fixture playlist.mix, which the baseline treats as the control row.
duration on Chapter. playlist type="audiobook"'s items (SPOKEN_ITEM) and track type="chapter" (trackCommon). Fixtures playlist.audiobook and track.chapter.
duration on CreativeWork. playlist type="series"'s items and track type="talk". Fixtures playlist.series and track.talk.

duration's domain is Audiobook, Episode, Event, MediaObject, Movie, MusicRecording, MusicRelease, QuantitativeValueDistribution, Schedule and ServicePeriod. PodcastEpisode (an Episode) and VideoObject (a MediaObject) are fine. Both tables already reason this way about byArtist (plugins/media/src/tags/track.ts, playlist.ts), but the same reasoning was not applied to duration or to the mix row.

The same run shows a value defect the validator does not catch, because it does not check ranges. track-meta lands on datePublished as "March 2025", which is not an ISO 8601 date (playlist.podcast). Fix it here or split it out, but don't lose it.

Environment

@refrakt-md/media at main, 2026-10-08
schema.org vocabulary 30.1