listUserObjects
listUserObjects ="SELECT hd.datatree_id as {datatree_id}, user_uid as {user_uid}, datatree_name as {datatree_name}, datatree_ctag as {datatree_ctag}, datatree_synctoken as {datatree_synctoken}, attribute_value as {attribute_value}, '30' as {perm_object} FROM horde_datatree hd INNER JOIN horde_datatree_attributes USING (datatree_id) WHERE group_uid = :group_uid AND user_uid = :user_uid AND attribute_name = :attribute_name;" :string