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=== Proposal for supporting WS-MetadataExchange on Axis2 ===

Metadata Exchange is an implementation to support WS-MetadataExchange specification published by IBM, Microsoft, BEA Systems, SAP, and Sun Microsystems. The WS-MetadataExchange specification essentially allows for a service requester to issue a standardized request message that ask for some or all of the metadata documents such as WSDL, XSD schema, policy associated with a Web service. The request to issue is a Get Metadata request message. This kicks off a standardized request and response MEP resulting in the delivery of a Get Metadata Response message.

To support incoming Get Metadata request message from SOAP protocol engines, Axis2 SOAP processing is extended with new metadataExchange module, and allows plug-in of Data Locators. Data Locator is responsible to perform data retrieval. The plug-in support allows other Web Services engines that build on top of Axis2 to support different data retrieval implementation. 

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