cocoa - Is it possible to have multiple document types for one NSPersistentStoreCoordinator? -

i have 2 different entities in core data model: project , issue. each type has unique attributes, want use different uti document type each entity. each uti document type should have extension. unfortunately, nspersistentstorecoordinator allows set 1 file extension.

so question how export more 1 document type same extension.

have tried in target->get info->properties:

i haven't tested, assume work.