Web Services Metadata Exchange (WS-MetaDataExchange)
Web Services Metadata Exchange (WS-MetadataExchange) defines three request-response message pairs to retrieve three types of metadata: one retrieves the WS-Policy associated with the receiving endpoint or with a given target namespace, another retrieves either the WSDL associated with the receiving endpoint or with a given target namespace, and a third retrieves the XML Schema with a given target namespace. Together these messages allow incremental retrieval of a Web service's metadata.
More information: WS-MetadataExchange page on the W3C website
More on the general topic: Service
- Web Services Description Language (WSDL)
- Web Services Dynamic Discovery (WS-Discovery)
- Web Services Endpoint Language (WSEL)
- Web Services Policy Framework (WS-Policy)