[xsl] character map "range" in XSLT

[David <dlee@xxxxxxxxxxx>]

I'm writing a XSLT that has to translate XML to plain ascii text.  The 
XML contains unicode characters, possibly any of them.  I cannot control 
the authoring so I must handle whatever is thrown at me.

I have a few dozen specially know character translations for things like 
1/4 and degrees unicode symbols.
But I have a need to "catch all" charactors that are not mapped 
explicitly (rather then map explicitly the entiure unicode set) and 
translate them into something like "<UNKNOWN CHARACTER>"

Any suggestions on how to do this ? I could trivially write a 
post-processor to do this (maybe a dozen lines of C or java) but if 
there's a feature directly in XSLT I'd love to try that.

Any ideas welcome !

-David

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David A. Lee
dlee@xxxxxxxxxxx
http://www.calldei.com
http://www.xmlsh.org