xquery
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MonetDB database system with XQuery front-end
MonetDB/XQuery provides XML database functionality comprising quite complete support for the XQuery language, including modules, transaction-safe XUpdate functionality, user-defined functions, and a qXQilla: XQilla Homepage
XQilla is an XQuery∞ and XPath 2∞ library and command line utility written in C++, implemented on top of the Xerces-C∞ library. It is made available under the terms of the Apache License v2.XML Query Use Cases
The use cases listed below were created by the XML Query Working Group to illustrate important applications for an XML query language. Each use case is focused on a specific application area, and contOracle Berkeley DB XML
Oracle Berkeley DB XML is an open source, embeddable XML database with XQuery-based access to documents stored in containers and indexed based on their content. Oracle Berkeley DB XML is built on top