Early Adopter XQueryeBook - 2003
Working it's way towards W3C Recommendation status sometime in 2002, the XQuery language and associated specifications are the biggest project to date from the World Wide Web Consortium since it ratified XML in 1998. XQuery is to XML data as SQL is to data in relational databases and more - a single syntax that allows us to specify queries on structured XML data, independent of how and on what platform it is stored, and return the results as XML in a structure of your choosing. It is also one of the first large scale attempts to get the various W3C specifications in line with each other, uniting the XSL, XQuery, and XML Schema working groups in its creation.
Publisher: Berkeley, Calif. : Apress, c2003 (Norwood, Mass. : Books24x7.com [generator])