Using the XPath Expression Editor
XPath (XML Path Language) is a query language, defined by the W3C, for finding information in an XML document. You can use XPath expressions in your BPEL process to perform conditional processing, manipulate XML, anad compute values.
For a complete XPath functions reference, see XPath Functions and Operators.
The XPath Expression Editor
The Design Studio has an XPath Expression Editor, which is accessible through the Create Copy Rule dialog box, that helps you build valid copy rules using XPath. You can also use the Xpath Expression Editor to insert text into RESTful service Body properties and Email activity messages. The XPath Expression Editor contains functions and operators for XPath 2.0.