Separation of Dynamic and Static parts

I have a huge problem when committing rest test cases to subversion. It happens because I change test case properties and "run test case" step properties and thus I change the xml file that gets saved out every time. When I then go to commit the test cases, every single test case has changed, when only the test cases that I have modified functionality should have changes.

Basically what I want is some kind of separation in xml files depending on if the xml stores static functional data or if the xml stores data.