I am not a huge fan of PHP, but you can do some useful stuff to XML using the PHP command line tool, provided you have the right libraries installed. I have run

I am not a huge fan of PHP, but you can do some useful stuff to XML using the PHP command line tool, provided you have the right libraries installed. I have run into situations where the package manager on a machine I'm using doesn't have an up to date xmlstartlet or xmllint, and have tidily gotten around this problem using PHP.