Hi Jackie,
XML-RPC/SOAP protocols deal with XML parameters following their specific protocols. If you want to know the XML format, they both use Zend servers, that themself use the PHP implementation of these protocols.
You can google for the XML format, but I would advice to use the REST protocol, it's much faster. The REST parameters format can be found into Admin > Plugins > Web service > API documentation.
Good luck,
Jerome
Web services
Can a web service handle XML?
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