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RE: XSLT paradox - XSLT as one way encryption scheme?

I have a question/observation about XSLT.
If we look at the equation, where :
as well as
we find that XSLT in fact is an (effective?) one way encryption scheme. 
I doubt it's a very strong encryption scheme, though that no doubt depends
on the stylesheet. I tend to think of a stylesheet as a function output =
xslt(input). And it's certainly a one-way function.
Is this intended behavious, should i t be so, and is this addressed in XSLT
I think a reversible transformation would be a very different animal, and
would require a much more restrictive language. For example, how could you
possibly reverse the effect of the stylesheet:
<total xsl:version="1.0" xmlns:xsl="..." value="{sum(//item/@value)}"/>
Mike Kay

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