Last modified: 2012-12-13 11:21:07 UTC
Check where in the current code the item namespace is assumed, and see how to appropriately extend that for the other entity namespaces. This includes a registry or simple list of all entities in the given Wikibase instance .
There are some stuff in handlers for hooks that needs fixing, Wikibase.hooks.php
Adressed by I3e96a402
Verified in Wikidata demo time for sprint 18