@classmethod<EOL><INDENT>def load(cls, stream, contentType=None, version=None):<DEDENT>
raise NotImplementedError()<EOL>
Reverses the effects of the :meth:`dump` method, and returns the
de-serialized Item from the file-like source `stream`.

Note: `version` will typically be ``None``, so it should either be
auto-determined, or not used. This is an issue in the SyncML
protocol, and is only here for symmetry with :meth:`dump` and as
"future-proofing".