Contexts for prezi3 and image3 (and new version of other specs)

[zimeon]

With the introduction of relationships from Image API info.json to Presentation API objects, we have a problem with circular context inclusion if we attempt to split the contexts by API. Discuss at Princeton arrived at an provision solution in that we will maintain distinct contexts for each API, but they will simply include a combined/shared context defining all terms and class. This will be placed under that Presentation API tree as that API is by far the dominant one by terms and classes. Thus we will have documents:

• http://iiif.io/api/presentation/3/context.json -- Presentation 3.x context
• http://iiif.io/api/image/3/context.json -- Image 3.x context
• http://iiif.io/api/presentation/3/combined-context.json -- Guts for Presentation 3.x and Image 3.x contexts

This unfortunately leads to even more tying of versions together. With minor releases we continue to update the combined-context.json as we would for split contexts. If there is a major release of Presentation before Image, then there would new combined 4.x context and the Image 3.x context might be updated to point to that. If there is a major release of Image before Presentation then the combined context would be updates to include anything new for Image 4.x.

[azaroth42]

Discussed on JSON-LD WG call of 2018-10-19. @azaroth42 and @gkellogg will try to come up with fixture artifacts and a proposal. Agreed that circularity is less of a problem than recursion depth.

[azaroth42]

Recursive scoped contexts working in the playground: http://tinyurl.com/yayh6e74

Propose we revert to using this pattern.

[zimeon]

The link above gives the error jsonld.ContextUrlError: Cyclical @context URLs detected. -- @azaroth42 can you clarify the proposed way forward?

[azaroth42]

Yeah, it is an issue. Will be resolved in JSON-LD 1.1, as it SHOULD work.

[azaroth42]

Somewhat fixed in JSON-LD 1.1 (at least in the spec) so unblocking.

[zimeon]

Editors agree that now this is fixed in JSON-LD 1.1 we will re-split the two contexts in order to separate Image and Prezi stuff

[zimeon]

Closed by merge of #1810