<xsl:variable name="calc" select="(10 - ((sum($odd) * 3) +
sum($even)) mod 10) mod 10" as="xs:integer"/>
<xsl:if test="$calc ne $check-digit">UPC not legal</xsl:if>
foo mod 10 mod 10 is the same as foo mod 10, and 10 mod 10 is 0 so the
above is
<xsl:if test="($check-digit + ((sum($odd) * 3) + sum($even))) mod 10 =0">
David
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