[SOLVED] How To Stop XSL Outputting Unwanted Namespaces

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Unwanted namespace in transformed XML

I'm using XSL quite a lot now and several times I've had an issue with namespaces in the output XML/XHTML. In particular if you're using xpath-functions then you might have the xmlns:fn namespace finding it's way into your output. I've finally found the solution and though I'd better post it before  I forget it.

Lets see some an example of the problem.