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Protégé is a free , open source ontology editor and knowledge-base framework.
The Protégé Ontology Editor and Knowledge Acquisition System
Bringing Ontology Development and Maintenance to the Mainstream Ontologies supply the structure for relating information to other information in the semantic Web or the linked data realm. Ontologies provide a similar role for the organization of data that is provided by relational data schema.
A New Methodology for Building Lightweight, Domain Ontologies » AI3:::Adaptive Information
SWRL: A Semantic Web Rule Language Combining OWL and RuleML
This document is available under the W3C Document License . See the W3C Intellectual Rights Notices and Disclaimers for additional information. This document contains a proposal for a Semantic Web Rule Language (SWRL) based on a combination of the OWL DL and OWL Lite sublanguages of the OWL Web Ontology Language with the Unary/Binary Datalog RuleML sublanguages of the Rule Markup Language. SWRL includes a high-level abstract syntax for Horn-like rules in both the OWL DL and OWL Lite sublanguages of OWL. A model-theoretic semantics is given to provide the formal meaning for OWL ontologies including rules written in this abstract syntax. An XML syntax based on RuleML and the OWL XML Presentation Syntax as well as an RDF concrete syntax based on the OWL RDF/XML exchange syntax are also given, along with several examples.