I played with the Cooktop XML Editor for a bit last and I applaud the author or authors, but I just didn't get it. I didn't find it intuitive or easy to get my head around at all. After 30 minutes of trying to open an XML file and its associated schema I gave up. Control Panel-->Settings-->Add/Remove programs. See ya!
I don't know why I went out cruising for a quick XML Editor romp last night anyway. It was late, I was listening to a Smooth Jazz stream at the time, was feeling a bit vulnerable...oh, I had a hundred good reasons at the time. But I remain of the opinion that to learn XML that you should roll your own test, validate, transform and query environment. You build it, live with it, grow with it. Yes, life is a-okay!