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Approximate Reasoning trades completeness and soundness for increasing speed.
The focus of this project is to develop scalable reasoning techniques for OWL ontologies.
ontometrics is a Java framework for computing ontology metrics. It is aimed at support metrics on OWL ontologies, but other onology languages can be added to its flexible design.
Top Engine the Semantic Web Engine for the Enterprise. Top Engine is a Business Rule Engine that utilize OWL DL ontologies for vocabulary primitive to write rules on top of ontology. Top Engine support forward and backward chaining with truth maintenance