Versioning, Annotation

Special class owl:Ontology with special properties:
- owl:imports, owl:versionInfo, owl:priorVersion
- owl:backwardCompatibleWith, owl:incompatibleWith
- rdfs:label, rdfs:comment can also be used
One instance of such class is expected in an ontology file
Deprecation control:
- owl:DeprecatedClass, owl:DeprecatedProperty types

OWL Versioning, Annotation