def loadItem(self, stream, contentType=None, version=None):
raise NotImplementedError()<EOL>
Reverses the effects of the :meth:`dumpItem` 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:`dumpItem`
and as "future-proofing".