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6. Ontology Versioning

Ontologies are like software, they will be maintained and thus will change over time. Within an owl:Ontology element (discussed above (http://www.w3.org/TR/2004/REC-owl-guide-20040210/#OntologyHeaders)), it is possible to link to a previous version of the ontology being defined. The owl:priorVersion property is intended to provide this link, and can be used to track the version history of an ontology.

<owl:Ontology rdf:about="">

  ...

  <owl:priorVersion rdf:resource="http://www.w3.org/TR/2003/CR-owl-guide-20030818/wine"/> 

  ...

</owl:Ontology>

The indicated ontology is a previous version of the one being defined.
Ontology versions may not be compatible with each other. For example, a prior version of an ontology may contain statements that contradict the current version. Within an owl:Ontology element, we use the tags owl:backwardCompatibleWith and owl:incompatibleWith to indicate compatibility or the lack thereof with previous ontology versions. If owl:backwardCompatibleWith is not declared, then compatibility should not be assumed. In addition, owl:versionInfo provides a hook suitable for use by versioning systems. As opposed to the previous three tags, the object of owl:versionInfo is a literal and the tag can be used to annotate classes and properties in addition to ontologies.
For many purposes, doing version tracking at the granularity of an entire ontology is not enough. Maintainers may wish to keep version information for classes, properties, and individuals - and even that may not be sufficient. The incremental nature of class expressions in OWL implies that one ontology may add restrictions to a (named) class defined in another ontology, and these additional restrictions themselves may require version information.
OWL Full provides the expressive power to make any sort of assertion about a class, i.e. that it is an instance of another class, or that it (and not its instances) has a property and a value for that property. This framework can be used to build an ontology of classes and properties for tracking version information. The OWL namespace includes two pre-defined classes that can be used for this purpose: owl:DeprecatedClass and owl:DeprecatedProperty. They are intended to indicate that the class or property will likely be changing in an incompatible manner in a forthcoming release:

...

  <owl:DeprecatedClass rdf:ID="&vin;JugWine" />

  <owl:DeprecatedProperty rdf:ID="&vin;hasSeeds" />

...  ? 

It is important to note that owl:DeprecatedClass and owl:DeprecatedProperty have no additional semantics and it is up to tool developers and OWL users to ensure they are used as intended.

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