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March 10, 2003 | New data or requests for data arrive from transaction-processing systems through Web service requests. Essentially, the following protocol is used: A software service — for example, access to a particular database — is registered as a Web service in a directory on the Internet (or intranet). All user software processes (services) are registered with security, access, and control rights. Application interfaces are coded as messages sent over RPC TCP/IP protocols sending and receiving XML messages. An application need only know the XML message protocol and how to respond.


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