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XQuery from the Experts: A Guide to the W3C XML Query Language Review by W Boudville
Nice coverage of XQuery/XPath
A very useful explanation of XQuery and how to use it to analyse XML data. The book shows how this can be done with or without a supporting XML Schema or DTD that describes the XML. The authors explain why this goes beyond a Google-type search. The latter does not (at least currently) know or use any structural information about data, primarily because it scans all types of mostly unstructured data.
But the rise of XML has driven demand for XQuery, to take advantage of this structure. The book also shows how XPath is used, as part of the XQuery implementation.
Another merit of the book is its good description of the difference between XQuery and XSLT. The latter also has been getting a lot of attention from programmers. But, as explained by the authors, XSLT is mainly used on document centric data, mostly to generate HTML. By contrast, XQuery has no such restriction.