In the past few years, the W3C has been establishing standards for the fundamental building blocks of the Semantic Web. With RDF a common data model has been provided. A major step was the introduction of the ontology definition languages RDFS—offering very basic semantics—and the Web Ontology Language OWL As these standards are still very new, only a limited support of tools for inferencing and querying exists. Still, the availability of such tools will be crucial for the development of the Semantic Web.
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