<xsl:for-each-group select="Song"
group-by="substring(Year, 1, 3)">
<p>Decade: <xsl:value-of
select="current-grouping-key()"/>0's</p>
<xsl:for-each-group select="current-group()"
group-by="Title">
<p style="margin-left: 1pc;">
<xsl:value-of select="current-grouping-key()"/>
</p>
</xsl:for-each-group>
</xsl:for-each-group>
Why is "value-of" required and "apply-templates"
illegal?
Neither is required or illegal, they just do different things.
A group contains many nodes (in the current-group()) sharing one
grouping-key. If you process the grouping key you get one thing output, if
you process the current-group you get many things output.
Michael Kay
http://www.saxonica.com/
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