Generating sample XML instances from a Schema (using X

Are there any XSLs out there that can instantiate (transform) a Schema into
a
sample XML document?

...something similar to the effect of XMLSpy's "Generate Sample XML File"
command - except that the process needs to be automated...

If not, what's the current best practice for acheiving this? I would have
thought that this sort of application would be in widespread use, but I have
searched far and wide with little practical result..


Assistance much appreciated.



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