Comment 72 for bug 1389723

see comment 14...

just writing to indicate that an important change in the handling of file names was made in rev 14965, thanks Tav!

Previously the variable 'inkscape:version' would get overwritten on a file load, so that it was not possible for a Python extension to determine the rev number of the original file. Meaning that the user would not know if a scaling operation was required or not. Now it is possible to read this information using the Python code:
self.document.getroot().get(inkex.addNS('version',u'inkscape'))

This removes one of the major obstacles preventing further development of this extension.
I think it would be worthwhile to re-start the evaluation of this extension.