An excellent discussion on the requirements for Entity Resolution and the challenges of Connecting the Dots without a single mention of “disambiguation.” :-)   This problem has massive scale and data entanglement - RDF/OWL is not the answer - but I suspect neither is an RDBMS. It seems the problem is more about the connectivity between entities and the context of the information about the entity versus the entities themselves. Take note of Jonas’ “Flip/Flop” or rollback requirement - reminds me of deleting triples created through rule based inferencing.