XML-file consistency

Is it possible for you to keep the order of the XML properties consistent?

If I save a file, I have:
<text>blah
<tabvpostition>top
<selectedindex>0
<size>10
<tabhposition>right

Next time I save it, I get:
<size>10
<text>blah
<tabvpostition>top
<selectedindex>0
<tabhposition>right
(where <size> moved from 4th position to 1st).

So each time I save mockups, some of the files change but the semantical content does not change, and I have to check in the file into our versioning system with virtually no difference to the previous version. I know, memory space (for the versioning system) is cheap, but tracking differences will take time if I want to go back to an older version.

If it's easy for you to keep the order consistent, please do so.</size></tabhposition></selectedindex></tabvpostition></text></size></tabhposition></size></selectedindex></tabvpostition></text>