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Process XML using XML Query

Now in IBM developerWorks: Process XML using XML Query (Tutorial) -- For years developers have been using SQL to retrieve data from structured sources such as relational databases. But what about unstructured and semi-structured sources, such as XML data? To be viable as a data source, XML needed a means for conveniently retrieving the data. XQuery provides this means, allowing developers to write a statement that both extracts data and (if necessary) structures the results as XML. This tutorial shows you how to use XQuery to retrieve information from an XML file. It also explains the ways in which XPath changes with version 2.0, and what those changes mean for data management.