Most of the XML books (straight one, not XML for VB for example) contains the same TOC but this one has the best approach so far.
If you are new to XML, take this one.
If you know a bit of XML (and PROGRAMMED it), you can take the Professional XML which will go a little bit more in depth (not that much)
If you know what you are doing with XML and wants to learn more about XSLT, get the XSLT Programmer's Reference(great book) from Wrox.
If you want a very good Case-Study, take the Professional XML Design and Implementation (also good).
Then you are off with ASP XML, VB XML, or Java XML.
Happy XML hunting.
Many times, half a sentence says one thing and the other half contradicts the first half. Sometimes, at critical locations, it is impossible to figure what the author is trying to say. While writing, do not assume that the readers know what in your mind is. Please write clear/simple sentenses. Figures could be used to explain concepts rather than writing a paragraph. The book needs editing. Content-wise, the book is great.