Re: nesting flat XML based on attribute value.

> it needs to some how remember what it has already grouped (s

Or rather you just shouldn't select them from your template matching
<ch> (which is where I guess they are being generated)

The chapter template just wants to select top level sections which
appear to be sections with an id length of 8.
<xsl:template match="chapter">
 <xsl:copy>
   <xsl:apply-templates select=
      "sec[string-length(@id)=8]/>
 </xsl:copy>
 </xsl:template>
or perhaps the string length is dependent on the id of the current
chapter, whatever.

David

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