XML-RPC makes it possible for two computer systems running different operating systems to make a remote procedure call over the Internet. The call is made using http as the transport and XML for the encoding. The body of the http request is XML documenting the method name and input parameters, while the http response contains XML with the remote procedure call result. XML-RPC evolved into SOAP, but it is still supported in a variety of public Web APIs. To read more, go to Wikipedia or XML-RPC.com
OpenSearch is a set of simple XML data formats for the sharing of search results and extending existing data formats such as Atom and RSS. OpenSearch consists of a XML document that describes the availability of a search engine, a template for URLs that describe how to invoke a search, extensions to Atom and RSS to report paginated search results, and an auto discovery mechanism for the description documents. A number of significant Web APIs support OpenSearch, including Google Contact and the Google Book Search Data service. For more, see Wikipedia or OpenSearch.org
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