XSLT的分组

数据如下：

<Users>  
   <User id="2" name="ABC" Division="HR"/>   
   <User id="3" name="xyz" Division="Admin"/>   
   <User id="4" name="LMN" Division="Payroll"/>  
   <User id="5" name="PQR" Division="HR"/>  
</Users>

想要这样的效果：

<AllUsers>
  <Division value="HR">
    <User>
      <id>2</id>
      <name>ABC</name>
    </User>
    <User>
      <id>5</id>
      <name>PQR</name>
    </User>
  </Division>
  <Division value="ADMIN">
    <User>
      <id>3</id>
      <name>XYZ</name>
    </User>
  </Division>
  <Division value="Payroll">
    <User>
      <id>4</id>
      <name>LMN</name>
    </User>
  </Division>
</AllUsers>

代码的实现方式：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" />
  <xsl:key name="division" match="User" use="@Division" />
  <xsl:template match="Users">
    <AllUsers>
      <xsl:apply-templates select="User[generate-id(.)=generate-id(key('division',@Division)[1])]"/>
    </AllUsers>
  </xsl:template>
  <xsl:template match="User">
    <Division value="@Division">
      <xsl:for-each select="key('division', @Division)">
        <User>
          <id>
            <xsl:value-of select="@id" />
          </id>
          <name>
            <xsl:value-of select="@name" />
          </name>
        </User>
      </xsl:for-each>
    </Division>
  </xsl:template>
</xsl:stylesheet>