I tried this:
<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:apply-templates
select="current-group()/Title"/>
</p>
</xsl:for-each-group>
</xsl:for-each-group>
but still get two "Strangers in the Night".
Well, your inner current-group() holds two copies of "Strangers in the
Night" and if you apply-templates to both of them, you're going to get both
of them output. The whole point of grouping them is that you process them as
a group, not individually. For example you might do
<p><xsl:apply-templates select="current-group()[1]/Title"/></p>
<p><xsl:apply-templates select="current-group()/*[not(self::Title)]"/></p>
Michael Kay
http://www.saxonica.com/
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