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For validation purposes, the documents can be validated against DTD, W3C XML Schema, RELAX NG, Schematron, NRL and NVDL schemas.
The repository manages artifacts like schemas (e.g. XML Schema or RELAX NG), service descriptions (e.g. WSDL), business process definitions (e.g. BPEL) and policies (e.g. WS-Policy).
The form "Schema" (capitalized) in common use in the XML community always refers to W3C XML Schema.