so you just want
<xsl:variable name="sorted">
<xsl:for-each select="DOCUMENT">
<xsl:sort select="AUTHOR/>
<xsl:sort select="ID"/>
,xsl:copy-of select="."/>
</xsl;variable>
<xsl:for-each select="exslt:node-set($sorted)">
....
and now docuemnt order and sort order are the same so you can use
preceding-sibling::*[1]/ID to do column 3.
David
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