Re: character map "range" in XSLT

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 !

 <xsl:template match="text()">
    <xsl:for-each select="string-to-codepoints(.)">
      <xsl:value-of select="if ( . ge 32 and . le 127 )
                            then codepoints-to-string(.)
                            else concat('&lt;UNKNOWN CHARACTER-',.,'>')"/>
    </xsl:for-each>
  </xsl:template>

 http://www.iso.org/iso/catalogue_detail.htm?csnumber=51085
 http://www.asahi-net.or.jp/~eb2m-mrt/crepdl/ns/structure/1.0/index.xml
 http://www.assembla.com/spaces/CrepdlValidatorInFsharp

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