With the release of Oracle Database 10g Release 2, Oracle introduced a full-featured, native XQuery engine integrated with the database that can be used to accomplish various tasks involved in developing an XML-enabled application. A query language designed to work with the XML data model, XQuery can actually operate on any kind of data that can be expressed in XML. Although the Oracle XQuery implementation enables you to work with both database data and external sources, Oracle XML DB generally provides significant performance improvements when processing structured data stored in the database.
The examples presented in this article demonstrate not only where and how XQuery can be used to query, construct, and transform XML, but also how to monitor and analyze the performance execution of XQuery expressions, finding more-efficient ways to process the same workload.
Article from OTN
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