Parameters in XMLSpy

[Derek Fountain]

I'm evaluating XMLSpy, and can't find how to get parameters into it at
runtime. That is, my XSL has a line like this one:

<xslaram name="targetLanguage"/>

and on my Linux command line I can say:

xsltproc --stringparam targetLanguage en key.xml

thus giving the 'targetLanguage' parameter a value of "en".

How do I set the 'targetLanguage' in XMLSpy?