def yaml(self):
        return yaml.dump(self.serialized, default_flow_style=False,
                         encoding=None)
def __init__(self, m1, m2):
        super(xormatcher, self).__init__(m1._root, m1._cwd)
        self.traversedir = m1.traversedir
        self.m1 = m1
        self.m2 = m2