* Move parsing/serialization of XML requests/responses from ``xmlutils.py`` to ``__init__.py``.
* Log XML requests/responses in pretty-printed form.
* Previously only the responses were logged in readable form. This is useful for debugging.
* The XML documents are only converted for pretty-printing if debugging is enabled (it's expensive)
* Send XML responses in minimized form to clients.
* Add **encoding** attribute to XML declaration in XML response.
* Only decode XML requests once. (Previously they were decoded, encoded and decoded again.)
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