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A Collection Object can have four Datastreams, although the COLLECTION_POLICY is the only mandatory stream. If you do not have a COLLECTION_POLICY Datastream, additional objects cannot be ingested as members of that collection object. In other words, in order to add items to a collection or sub-collection, the collection object (or “parent-type” object) must have a COLLECTION_POLICY stream. Here is an example of a COLLECTION_POLICY Datastream (as viewed using the Islandora interface to view in a browser)

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The COLLECTION_POLICY Datastream must have a isMemberOfCollection relationship declared, and must be affiliated with the islandora:collectionCModel. 

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