What XML books do you recommend?

XML is everywhere - I am looking for a book that would summarize some key aspects of practical use of XML with possible problems and solutions not a "XML bible" thing.

Thanks for feedback in advance!

From stackoverflow Kamil Zadora

• There's a Wikibook on XML available here.

  There's also quite a lot of material at w3schools.

  From OysterD

• I have never read any books on XML, but I think W3C's tutorial gives a nice introduction. Once you understand the basics, the official XML recommendation is also good for reference.

  From Anders Sandvig

• Applied XML Solutions is a little older (2001) but provides a lot of practical examples. It's organized as a series of projects with real-world relevance. It helped me on a few projects back in the day.

  From David Crow