<xsl:template match="//Group
don't start a match with // (it doesn't do anything) at all in this
case.
<xsl:copy select=".">
that's a syntax error xsl:copy doesn't take an attribute
key('attribute-format-by-key',@Key)
that returns a Attribute-Format element so
key('attribute-format-by-key',@Key)[(_at_)ColIndex]
returns that element if it has a ColIndex attribute and nothing
otherwise.
I didn't follow all your description but I think you want
<xsl:template match="Grouping[not(key('attribute-format-by-key',@Key)]"/>
and
<xsl:template match="Grouping">
<xsl:copy>
<xsl:attribute name="ColIndex">
<xsl:value-of
select="count(key('attribute-format-by-key',@Key)/preceding-sibling::*)"/>
</xsl:attribute>
</xsl:copy>
</xsl:template>
David
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