'Replace the extended identity data for a JID/node combination.
The data parameter is not used.'

def del_extended_info(self, jid, node, ifrom, data):

    with self.static.lock:
        if self.static.node_exists(jid, node):
            info = self.static.get_node(jid, node)['info']
            for form in info['substanza']:
                info.xml.remove(form.xml)
