It is a set of specifications and implementations that makes applications running in different environments; different operating system can talk to each other by making remote procedure call. An RPC-based Web service is a collection of procedures that can be called by a remote client over the Internet. XML-RPC is the makes it easy for distributed systems and system interoperability. This allows a perl function to make a call to a Python method, or a Java Servlet to call a PHP function.
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