The Web Service Modelling Ontology (WSMO) defines the conceptual elements that have to be expressed in order to describe and use Semantic Web Services. Those are Ontologies, Mediators, Web Services and Goals. A component based approach can enable integration and reuse of common functionality, so that this work can be taken as the basis of future extension, e.g. for a versioning system or for the integration of different reasoners for various tasks. The aim of this paper is to outline the exact functional requirements as well as the architecture we are using to accomplish these requirements.
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