def __init__(self, content=None, attr={}): Elem.__init__(self, tag="img", attr=attr, content=content, tag_type='simple')
def __init__(self, content=None, attr={}): Elem.__init__(self, tag="ul", attr=attr, content=content, tag_type='double')
def __init__(self, content=None, attr={}): Elem.__init__(self, tag="meta", attr=attr, content=content, tag_type='one')