Robyn -
Even though I'm reading this long after it was posted, THANKS.
I have tried to take up XML, and everytime I get some book that based on a glance at the index is supposed to 'discuss' XML, invariably the author starts their whole page and a half coverage of the subject with - XML is of course too large of a topic to cover in this book...
So, I have never really made the effort. My reasoning being, "well, if it is too hard for an expert to explain, why bother?"
This cribsheet gave me an excellent high level view... I also give you high marks on the Jumpstart.
Perhaps you can provide an "Advanced Workbench" some day?