My script won’t run under the task scheduler. Why

Step 1: Open an elevated Task Scheduler (ie. right-click on the Task Scheduler icon and choose Run as administrator)

Step 2: In the Actions pane (right pane, not the actions tab), click Enable All Tasks History

That's it. Not sure why this isn't on by default, but it isn't.

You're probably using the built-in XSLT 1.0 processor that comes with the JDK, which is a version of Xalan. There's no standard way in either XSLT 1.0 or 2.0 to invoke an XML parser (which is what you need to do to convert a string to a node). You either need to do the conversion outside the transformation (passing a node as the parameter), or use an extension that does the job. I seem to remember that Xalan's implementation of exslt:node-set() might do this; check it out. Alternatively, since you're in the Java world, a whole lot of things would be much easier if you upgraded to XSLT 2.0 (meaning Saxon). I'm not sure how well Saxon plays with JSP though (it can certainly be done, but I don't know if you can use the x:transform tag library). Saxon has a saxon:parse extension function, which in the draft 3.0 specifications is replaced by a standard function parse-xml().