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Abstract
The World Wide Web is emerging not only as an infrastructure for data, but also for a broader variety of resources that are increasingly being made available as Web services. Although current standards like UDDI, WSDL, and SOAP form the basis of making Web services a workable and broadly adopted technology they are syntactic and therefore are plagued with problems like inefficient service discovery and composition. Semantic Web technologies are likely to provide better qualitative and scalable solutions to these problems. Semantic annotation of Web services is a critical first step to achieve the above promise. In this work we present MWSAF (METEOR-S Web Service Annotation Framework), a framework for semi-automatically marking up Web service descriptions with ontologies. We have developed algorithms to match and annotate WSDL files with relevant ontologies and to categorize Web services into domains. An empirical study of our approach is presented to help evaluate their performance.