MIME type for a collection. A collection of items.
"vnd.android.cursor.item/vnd.collectionista.product.collection" is a general MIME type for a collection. Depending on "item" or "dir" a single collection or a list of collection.
Also specific MIME types exist for collections of a specific type. An example is "vnd.android.cursor.item/vnd.collectionista.product.collection.cd" for a CD collection. See other URIs (not all will be listed in this registry).
Originally for Collectionista, but every collection manager can use these.