The event is signalled by dokuwiki_xmlrpc_server() in lib/exe/xmlrpc.php. You can use this event to register your own XMLRPC callbacks.

The XMLRPC server object.

The following plugins are known to handle this event and their source code may be a good start for understanding and implementing a handler yourself.

• Action Plugins
• Events
• XMLRPC

In the action.php or action plugin you will need to do a 2 step process.

First register the call back hook to a function that will actually add the xml-rpc call.

    function register(&$controller) {
        $controller->register_hook('XMLRPC_CALLBACK_REGISTER', 'BEFORE',  $this, 'registerCallback');
    }

Second register your function.

    function registerCallback(&$event) {
        $event->data->addCallback(
            'report.getReportData',
            'plugin:reports:getReportData',
            array('struct'),
            'blah.',
            true
        );
    }

The addCallback function is as follows. Note that the format for the second parameter is 'plugin:<plugin name>:<function name>'

function addCallback($method, $callback, $args, $help, $public=false)