1<?xml version="1.0"?> 2 3<xsl:transform 4 version="1.0" 5 xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 6 xmlns:exsl="http://exslt.org/common" 7 extension-element-prefixes="exsl"> 8 9 <xsl:template match="@*|node()" mode="copy"> 10 <xsl:copy> 11 <xsl:apply-templates select="@*|node()" mode="copy"/> 12 </xsl:copy> 13 </xsl:template> 14 15 <xsl:template match="/"> 16 <xsl:variable name="v"> 17 <xsl:apply-templates mode="copy"/> 18 </xsl:variable> 19 <xsl:apply-templates select="exsl:node-set($v)" mode="copy"/> 20<!-- replacing the above line with the following one increases speed --> 21<!-- <xsl:apply-templates select="." mode="copy"/> --> 22 </xsl:template> 23 24<!-- removing the following line increases the speed --> 25 <xsl:key name="tree-by-subject_id" match="tree" use="@subject_id"/> 26 27</xsl:transform> 28 29 30 31