'Remove an item from a JID/node combination.
The data parameter may include:
ijid  -- JID of the item to remove.
inode -- Optional extra identifying information.'

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

    with self.lock:
        if self.node_exists(jid, node):
            self.get_node(jid, node)['items'].del_item(data.get('ijid', ''), node=data.get('inode', None))
