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IIIF
highlight subcollection
This is a proposal for a new "highlight" property in the presentation API. It would be in some way an equivalent of start but for items in a collection. Basically the goal is to present a collection in the context of a greater collection. To give a visual example, I currently have my main collection displayed like this:
what would be very useful for our users is instead having the same collection but with a sub collection highlighted, which would give the following display:
Edit: The same mechanism could be applied to ranges: a manifest could be open at a certain range, or even a certain image within a certain range.
This might be accomplished via the content state API, but you couldn't guarantee the UI implementation would in fact highlight the entry. Start for collections was discussed in #1761 and deferred based on your same observation that content state might accomplish the goal, and there wasn't any implementations chomping at the bit for this. I think these are related, but perhaps worth considering separately.
However either way, we can't add new features to 3.0 at this stage so I've tagged as defer.
The highlight aspect is viewer dependent, but selection of the sub-collection (or other aspect) can now be done in content state. Closing.