additional item metadata (ideas from iiif)

[eroux]

iiif presentation API defines two properties we may want to fill in our metadata:

• viewingdirection (we have both top-to-bottom and left-to-right in our DB)
• another one I cannot find but I remember they talked about it during the workshop: a property pointing to the image sequence number of the first interesting page, typically used when you have several blank pages at the beginning of a book, in our case it could be used to point to the first page that is not a tbrc scan request, or to more meaningful values if relevant

[xristy]

both of those seem like good concepts to include. So we need to add :workViewingDirection and some associated individuals of :Type, ViewingDirection; and :workViewingStart with range int?

[eroux]

sounds reasonable yes