XSLT 和临时文档

我正在尝试处理一个 xml 文件，该文件有几个不同的状态组，例如

<root>
<childgroup>16</childgroup>
<setstate>init</setstate>
<child1>...</child1>
<child2>...</child2>
<setstate>process<setstate>
<child2>...</child2>
<child3>...</child3>
.....
<childgroup>17</childgroup>
...

我需要的是实际上得到类似的东西

<childgroup no="16">
  <state statename="init">
    <child1>...</child1>
    <child2>...</child2>
  </state>
  <state statename="process">
    <child2>...</child2>
    <child3>...</child3>
  </state>
</childgroup>
<childgroup no="17">
...

以下是如何一步使用 XSLT 1.0 进行分组的示例；样式表

<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">

  <xsl:output indent="yes"/>

  <xsl:key name="k1" match="root/*[not(self::childgroup)]" 
    use="generate-id(preceding-sibling::childgroup[1])"/>

  <xsl:key name="k2" match="root/*[not(self::childgroup) and not(self::setstate)]"
    use="concat(generate-id(preceding-sibling::childgroup[1]), '|', generate-id(preceding-sibling::setstate[1]))"/>

  <xsl:template match="root">
    <xsl:copy>
      <xsl:apply-templates select="childgroup"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="childgroup">
    <childgroup no="{.}">
      <xsl:apply-templates select="key('k1', generate-id())[self::setstate]"/>
    </childgroup>
  </xsl:template>

  <xsl:template match="setstate">
    <state statename="{.}">
      <xsl:copy-of select="key('k2', concat(generate-id(preceding-sibling::childgroup[1]), '|', generate-id()))"/>
    </state>
  </xsl:template>

</xsl:stylesheet>

变换输入样本

<root>
  <childgroup>16</childgroup>
  <setstate>init</setstate>
  <child1>...</child1>
  <child2>...</child2>
  <setstate>process</setstate>
  <child2>...</child2>
  <child3>...</child3>
  <childgroup>17</childgroup>
  <setstate>init</setstate>
  <child1>...</child1>
  <child2>...</child2>
  <setstate>process</setstate>
  <child2>...</child2>
  <child3>...</child3>
</root>

into

<root>
   <childgroup no="16">
      <state statename="init">
         <child1>...</child1>
         <child2>...</child2>
      </state>
      <state statename="process">
         <child2>...</child2>
         <child3>...</child3>
      </state>
   </childgroup>
   <childgroup no="17">
      <state statename="init">
         <child1>...</child1>
         <child2>...</child2>
      </state>
      <state statename="process">
         <child2>...</child2>
         <child3>...</child3>
      </state>
   </childgroup>
</root>