When working on an application that consumes data from a webservices XML response, you may find it useful to test your X-path expressions.

The people who developed Whitebeam application server have created an easy-to-use X-Path Expression testbed. You just upload a copy of the xml you are working with, and start typing xpressions into the textbox, click evaluate, and view the result.

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Try the XPath Expression Testbed here