def add_item(self,item):
if not isinstance(item,MucItemBase):<EOL><INDENT>raise TypeError("<STR_LIT>")<EOL><DEDENT>item.as_xml(self.xmlnode)<EOL>
Add an item to `self`.

        :Parameters:
            - `item`: the item to add.
        :Types:
            - `item`: `MucItemBase`