Example of asynchronous access
We will assume that the client connecting to the MDB web services is capable
of using different protocols.
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Web client asks for all Zn-containing proteins using the sql()
method of the XML-RPC server.
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XML-RPC server returns a result ID to client, then schedules query to be
executed and results stored for later retrieval.
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Query is executed and result set stored using the assigned ID.
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Client uses SOAP to retrieve result. Server retrieves stored result set,
and formats it as a complex structure using the appropriate XML Schema.
