As part of my project to create a tutorial for XML::LibXML, I created an XPath Sandbox tool that allows you to try out different XPath expressions directly in your browser. I've recently enhanced that tool to add a couple of useful features:

• 'Upload'* your own XML files, and query them
• Namespace support, including registering your own prefix mappings

When working with the built-in sample files, URL parameters can be used to: select a file, specify an XPath expression, override the def…