> > Portability is not the main issue with using extension functions.
> >
> 
> The portability of the message is the significance of XML.  The
> portability of stylesheets is often a secondary concern.  Local

True.  Another reason to use XSLT is because the functional approach is
superior for many transformation tasks.  I often find, however, that the
people who turn to extension functions are not necessarily people who
appreciate functional programming and thus I assume they must be using
XSLT for its portability (or hype-factor) rather than its elegance.
Obviously not *all* of the people looking for extension functions fit
into this category, but I'd bet a majority do.


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