Be resistant to unmanaged changes in the triple store.

The Ontology Manager should be able to detect changes in the underlying Clerezza store that affect the ontologies it is aware of:

• If there are orphan ontologies (i.e. entries whose corresponding Clerezza graphs have been deleted), then Stanbol should be aware of the inconsistency by throwing controlled exceptions and maintain a list of orphans.
• If there are stored graphs that are not managed by the Ontology Manager, then it should notify users and/or administrators of their presence, and possibly offer them a way to create new ontology entries to link them to.