Change History
NOTE: OGraph is derived from the DAML API which is now depricated.
An Ontology Graph is an implementatoin of a directed graph with interfaces and utilities to suport the creation and management of RDF based ontologies, including RDFS, DAML+OIL and OWL. It requires the KAON RDF API , and optionally the Jess expert system and Xalan XSL engine. See the Release Notes for details.
Please send all comments and questions to the CODIP support address .
Principle Features.
V0.8.0
This is the initail release of OGraph.
OGraph uses several third party products as specified below.
Version | Compatibility | ||||||||||||
V0.8 |
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The multi-type support in OGraph is somewhat slower that a single typed implementation. Some of the performance impact can be mitigated by using setType( ) and getType( ), rather than adding types as property instances. Note that getType() only retruns the type last set by setType(). This is safe only when it is known that the resources are single typed, otherwise use isType() to check resource type.
The internal resource collections are implementated by default as HashMaps of default size. reeMaps can be specified is a sorted resource lists are desired, but this reduce performance by roughly 20%. Appropriately sized HashMaps may also be specified during creation, this has a performance impact of 5%, which seems counter intuitive.