Hi Rob.

All these changes seem fine to me, except for this one (and the related use of `xml_find_prefix` below). I am not entirely sure what problem in Python 2.6 you are addressing, but if you just remove the `.//` prefix, then the xml find functions will only find tags which are immediate children of that searched. They will not find elements deeper in the xml hierarchy. So there is a fair chance that this will break stuff, and not just on python 2.6, but in all cases where ElementTree rather than cElementTree is imported (which I believe includes all versions of python 3). If you can tell us what the problem is with Python 2.6 we might be able to think of an alternative.