E-Commerce applications require the exchange of data in an interoperable manner. XML enables syntactic interoperability but more sophisticated E-Commerce applications require semantic interoperability as well. RDF is an application of XML intended to exchange semantics between Web applications. RDF schemata can be used to describe the concepts and constraints of a specific application domain at a semantic level. However there is no formal mechanism to state sophisticated semantics beyond the static set of concepts and constraints provided by RDF. This paper presents an approach extending RDF in a standard manner and utilizing a host formalism for formally defining semantics of new RDF schemata. An elaborated example applies the approach to security management. A tool, the RDF Schema Explorer, is available on-line,allowing to process, validate and query a first-order-logic interpretation of(extended) RDF Schemata.
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