Learning XML

[Itanius]

I'd like to learn XML. I can tweak, modify, etc. XML a little bit, just as I can with php. But I don't know either language enough to write something from scratch or create something from scratch with a WYSIWYG editor. I have a more-than-basic knowledge of these things, but I want to know more.

That being said, I'd like to learn these things the lazy way; without taking classes in school. I'm in the military and my work hours and free time change so much that going to school is most often unfeasible. So, I'd like to learn via CBTs or e-courses online.

Can anyone recommend some online classes, CBT courses, or even some lengthy/detailed tutorials?

Thanks in advance for any help!