It's a bit hard to grasp the user unit (aka SVG user units) concept at first, though many resources try to explain this. For my purpose, I simply need to know the following. Consider this bit of SVG XML:
<rect width="600" height="200" x="0" y="0" />
Are those numbers not given in user units? Or in other words, am I correct to say that this rectangle is 600 user units wide?