How to use the shyaml.ShyamlSafeDumper.add_multi_representer function in shyaml

class _E(data.__class__, EncapsulatedNode):
        pass

    _E.__name__ = str(node.tag)
    _E._node = node
    return _E(data)


def represent_encapsulated_node(s, o):
    value = s.represent_data(o.__class__.__bases__[0](o))
    value.tag = o.__class__.__name__
    return value


ShyamlSafeDumper.add_multi_representer(EncapsulatedNode,
                                       represent_encapsulated_node)
ShyamlSafeLoader.add_constructor(None, mk_encapsulated_node)


##
## Key specifier
##

def tokenize(s):
    r"""Returns an iterable through all subparts of string splitted by '.'

    So:

        >>> list(tokenize('foo.bar.wiz'))
        ['foo', 'bar', 'wiz']