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After restart, go to Site Admin → Ingest Data → Manage Jena Models.  Review the named graphs.  You should see:

Modifying or removing Removing the myOntology.owl file in from the filegraph directory and restarting Tomcat will automatically remove the named graph.  This will remove all ontology assertions made in myOntology.owl.  It will not remove abox assertions using myOntology.owl from the content triple store.

Namespace Prefixes

owl:Ontology statements result in the ontology being added to VIVO's Ontology List.  You might see an entry such as:

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