<xsl:function name="my:increase">
<xsl:param name="i" />
<xsl:value-of select="round(1.2 * $i)" />
</xsl:function>
but all the expressions in my
stylesheet which use this function seem to return non-numerical results.
value-of generates a text node with the string value of the number
probably something like
<xsl:function name="my:increase" as="xs:decimal">
<xsl:param name="i" as="xs:decimal"/>
<xsl:sequence select="round(1.2 * $i)" />
</xsl:function>
would return something that is a number for use in further xpath
computation. (untested)
David
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