Web Annotation Ontology in IIIF Manifest @context

[joncameron]

Description

Avalon currently writes http://www.w3.org/ns/anno.jsonld into the @context of all IIIF manifests. Running the IIIF validator against our manifests, the error "Top level @context is not known" appears. This seems odd because seeming this should be valid in the spec (https://iiif.io/api/presentation/3.0/#46-linked-data-context-and-extensions).

https://presentation-validator.iiif.io/validate?version=3.0&url=https://media.dlib.indiana.edu/media_objects/c821gr848/manifest.json

Is the validator wrong? And do we need to include this in the @context? I don't see it in other IIIF examples, and it could be implicit in IIIF Presentation 3. If it's superfluous it could be removed from our manifests.

Example: https://media.dlib.indiana.edu/media_objects/vx021n34x/manifest.json
https://presentation-validator.iiif.io/validate?version=3.0&url=https://media.dlib.indiana.edu/media_objects/c821gr848/manifest.json

Done Looks Like

• Determine if http://www.w3.org/ns/anno.jsonld is required
• Determine why the validator is flagging this
• Remove http://www.w3.org/ns/anno.jsonld if desired

[joncameron]

May not pose a problem in real-world uses. Would require a change to iiif_manifest gem, where it's being manually inlined for each manifest.

Could also reach out in IIIF Slack to see if there's any guidance there.

[cjcolvar]

Places where this context is added in iiif_manifest:
https://github.com/samvera/iiif_manifest/blob/75a3702d58982b37bb9ce327dcd6686273a6ccbb/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb#L82
https://github.com/samvera/iiif_manifest/blob/75a3702d58982b37bb9ce327dcd6686273a6ccbb/lib/iiif_manifest/v3/manifest_builder/iiif_service.rb#L93