werken.xpath is an implementation of the W3C XPath Recommendation, on top of the JDOM library. It takes as input a XPath expression, and a JDOM tree, and returns a NodeSet (java.util.List) of selected elements. Is is being used in the development of the as-yet-unreleased werken.xslt (eXtensible Stylesheet Language) and the werken.canonical (XML canonicalization) packages.