<xsl:function name="custom:equalPredecingItemCount" as="xs:integer">
<xsl:param name="preceding_items"/>
<xsl:param name="this_item"/>
<xsl:value-of select="sum(for $item in $preceding_items return
custom:getEqualityValue($item, $this_item))"/>
</xsl:function>
<xsl:function name="custom:getEqualityValue" as="xs:integer">
<xsl:param name="item1"/>
<xsl:param name="item2"/>
<xsl:value-of select="if (deep-equal($item1, $item2)) then 1 else 0"/>
</xsl:function>
A tip here - when the sequence type (as attribute) of the function is
an atomic, always use xsl:sequence instead of xsl:value-of.
When you use value-of you create a text node, which then gets atomized
to the sequence type, so you can avoid that unnecessary step by using
xsl:sequence which will return an atomic.
The general rule is 'always use xsl:sequence in xsl:functions', as you
pretty much always return atomics from functions.
(that's also a good interview question "what's the difference between
xsl:sequence and xsl:value-of)
--
Andrew Welch
http://andrewjwelch.com
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