Versioning, Annotation
- Special class
owl:Ontologywith special properties:owl:imports,owl:versionInfo,owl:priorVersion-
owl:backwardCompatibleWith,owl:incompatibleWith -
rdfs:label,rdfs:commentcan also be used
- One instance of such class is expected in an ontology file
- Deprecation control:
owl:DeprecatedClass,owl:DeprecatedPropertytypes