- 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