On 5/25/07, David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> wrote:
> <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">
Nice!
That give a boolean to check the UPC is correct - is it ok to re-write it as:
10 - ((sum($odd) * 3) + sum($even)) mod 10
to give you the check-digit? If so it makes the outermost "mod 10" of
$calc redundant? (if it is then step #4 on the wikipedia article isnt
needed)
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