This is a grouping problem (where you only want one group)

<xsl:key name="t" select="title" use="count(ancestor::*)"/>

...

<xsl:for-each select="//title">
<xsl:sort data-type="number" select="count(ancestor::*)">
<xsl:if test="position()=last()">
<xsl:apply-templates select="key('t',count(ancestor::*))"/>
</xsl:if>
</xsl:for-each>

David

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