How to use the shyaml.EncapsulatedNode function in shyaml

def mk_encapsulated_node(s, node):

    method = "construct_%s" % (node.id, )
    data = getattr(s, method)(node)

    class _E(data.__class__, EncapsulatedNode):
        pass

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

def type_name(value):
    """Returns pseudo-YAML type name of given value."""
    return type(value).__name__ if isinstance(value, EncapsulatedNode) else \
           "struct" if isinstance(value, dict) else \
           "sequence" if isinstance(value, (tuple, list)) else \
           type(value).__name__