Web service description and modeling is metadata management. Let's not reinvent the wheel.
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RDF has facilities to provide semantic transparency to descriptions and object models
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RDF's ability to express unevenly structured graphs is a perfect adjunct to XML's similar data representation capability
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RDF has proven ability to support a range of knowledge representation techniques
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RDF has proven scalability (at least on order of relational database technology)
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RDF integrates very well with most XML formats and technologies
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RDF is reaching a critical mass of useful vocabularies, implementations, tools and practice
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RDF supports more manageable XML data deployment by simplifying expression of inter-document relationships
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Web services can take advantage of the general work in RDF query, rules: integration into general search engines