This depends entirely on the interface for setting external parameters.
In many systems (I don't know sablotron) the basic (eg command line)
interface just passes in a string not a fragment of XML so no XML
parsing is done and a string á is the string of length 8 with
those charaters in not a string of length 1 as it would be if that
was parsed as XML. You may be able to pass a utf8 or other uniocde
encode string in directly in which case you should be able to pass in
the character itself not a numeric refernce to the character.
to see what is happening try putting
<xsl:value-of select="string-length($Kentry)"/>
somewher just as debugging output.
David
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