I just retested with the client the XML-RPC works. It works fine with the Zend client. We didn't plan to support XML-RPC protocol. The Zend server/client just looked to work fine so I committed it for people wanting to play with it.
Speaking about web service in general:
after a real first review of the web service code in Moodle HQ (thanks Petr), we decided to change the way to describe web service. We're going back to describe them into a PHP array instead of the phpdoc.
I wrote a chapter about the way to describe web service here : http://docs.moodle.org/en/Development:Web_services_security#Function_discovery
Roger, I guess it would be preferable that you wait till we decide and define accurately the way to describe web service.
PS: these change should not have any impact on the "Zend" XML-RPC cause this server use phpdoc information. The Rest server will be adapted by Ludo's team. It also will not change the Zend Soap server if you're using the Zend client. A SOAP server (using Zend or not) will need to be created to be compatible with JAVA and .Net.
Moodle 2.0: REST server
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