Define content types non-exclusively
Define content types non-exclusively, i.e., allow multiple content type definitions to apply to a single resource -- for example, the same resource might be both a "catalog" and a "book." Defining it as a "catalog" should not mean it is excluded in a search limited to "books."
Amy Edmonds commented
This is a critical issue for music materials. CDs often come with a booklet or libretto, and scores sometimes come with an accompanying CD.
Lucy Clifford commented
We'd like this. It would give the option to create local collections, to aid discoverability. For example, we'd like to have a facet for theses created by members of our institution, as we're regularly asked how to find these, but we don't want to exclude these items from the general 'thesis' facet.