This paper presents a framework for developing ontologies suitable for a dynamic environment, such as that for web services, and describes its use in a commercial system for resource discovery. This framework recognizes the importance of standards but allows for evolution in a way that doesn't disrupt those adhering to the standards. The framework is based on the notion of discoverable resources, which offer extensibility and security. The specific ontology we use in the system includes some salient features, such as attribute based matching rules and the corresponding constraint based search, attributes with dynamic values, and active queries.
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