Don't use encode('utf-8') on serialized XML. Return unicode strings for get_items() Rename get_items_by_ids() to get_items_by_id() as in the interface. Make purge() work. Don't return item ids when removing items.

register("Idavoll", "idavoll.tap",
         description="Jabber Publish Subscribe Component",
         type='tap', tapname='idavoll')