对xslt 1.0中的嵌套元素进行分组

Question

我一直在看XSLT1.0中Muenchian分组的例子，特别是这里的这个例子。然而，我无法让它在更复杂的XML结构上工作。

我的XML当前如下所示：

<?xml version="1.0" encoding="utf-8"?>
<ContestResults>
  <Contests>
    <Contest sportId="35">
      <Sport>Beach Volleyball</Sport>
      <Event>Men's</Event>
      <Ranks>
        <Rank position="1" eventId="1">
          <Athlete>Athlete 1a / Athlete 2a [GER]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="1">
          <Athlete>Athlete 1b / Athlete 2b [NED]</Athlete>
          <Result>0</Result>
        </Rank>
      </Ranks>
    </Contest>
    <Contest sportId="32">
      <Sport>Tennis</Sport>
      <Event>Women's Singles</Event>
      <Ranks>
        <Rank position="1" eventId="2">
          <Athlete>Tennis Athlete 1</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="2">
          <Athlete>Tennis Athlete 2</Athlete>
          <Result>1</Result>
        </Rank>
      </Ranks>
    </Contest>
    <Contest sportId="35">
      <Sport>Beach Volleyball</Sport>
      <Event>Men's</Event>
      <Ranks>
        <Rank position="1" eventId="3">
          <Athlete>Athlete 3a / Athlete 4a [AUT]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="3">
          <Athlete>Athlete 3b / Athlete 4b [SUI]</Athlete>
          <Result>0</Result>
        </Rank>
      </Ranks>
    </Contest>
    </Contests>
</ContestResults>

然而，当等级节点具有相同的运动和事件时，我想将它们分组在相同的等级父节点下。所以我希望结果看起来像这样：

<?xml version="1.0" encoding="utf-8"?>
<ContestResults>
  <Contests>
    <Contest sportId="35">
      <Sport>Beach Volleyball</Sport>
      <Event>Men's</Event>
      <Ranks>
        <Rank position="1" eventId="1">
          <Athlete>Athlete 1a / Athlete 2a [GER]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="1">
          <Athlete>Athlete 1b / Athlete 2b [NED]</Athlete>
          <Result>0</Result>
        </Rank>
        <Rank position="1" eventId="3">
          <Athlete>Athlete 3a / Athlete 4a [AUT]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="3">
          <Athlete>Athlete 3b / Athlete 4b [SUI]</Athlete>
          <Result>0</Result>
        </Rank>
      </Ranks>
    </Contest>
    <Contest sportId="32">
      <Sport>Tennis</Sport>
      <Event>Women's Singles</Event>
      <Ranks>
        <Rank position="1" eventId="2">
          <Athlete>Tennis Athlete 1</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="2">
          <Athlete>Tennis Athlete 2</Athlete>
          <Result>1</Result>
        </Rank>
      </Ranks>
    </Contest>
  </Contests>
</ContestResults>

我只是有点不知道如何做到这一点，因为只有其他例子处理的是一个简单得多的结构，我不确定这是否可能，也不确定我的密钥和模板需要如何结构化才能做到这一步。有人能举例说明如何实现这一目标吗？

如有任何建议，我们将不胜感激。

Answer 1

此转换：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>
 <xsl:key name="kContestById" match="Contest" use="@sportId"/>
 <xsl:template match="node()|@*">
     <xsl:copy>
       <xsl:apply-templates select="node()|@*"/>
     </xsl:copy>
 </xsl:template>
 <xsl:template match="Contests">
      <Contests>
       <xsl:apply-templates/>
      </Contests>
 </xsl:template>
 <xsl:template match=
  "Contest
    [not(generate-id()
    =
     generate-id(key('kContestById', @sportId)[1]))
     ]"/>
 <xsl:template match="Ranks">
  <Ranks>
    <xsl:apply-templates select="key('kContestById', ../@sportId)/Ranks/Rank"/>
  </Ranks>
 </xsl:template>
</xsl:stylesheet>

应用于所提供的XML文档时：

<ContestResults>
  <Contests>
    <Contest sportId="35">
      <Sport>Beach Volleyball</Sport>
      <Event>Men's</Event>
      <Ranks>
        <Rank position="1" eventId="1">
          <Athlete>Athlete 1a / Athlete 2a [GER]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="1">
          <Athlete>Athlete 1b / Athlete 2b [NED]</Athlete>
          <Result>0</Result>
        </Rank>
      </Ranks>
    </Contest>
    <Contest sportId="32">
      <Sport>Tennis</Sport>
      <Event>Women's Singles</Event>
      <Ranks>
        <Rank position="1" eventId="2">
          <Athlete>Tennis Athlete 1</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="2">
          <Athlete>Tennis Athlete 2</Athlete>
          <Result>1</Result>
        </Rank>
      </Ranks>
    </Contest>
    <Contest sportId="35">
      <Sport>Beach Volleyball</Sport>
      <Event>Men's</Event>
      <Ranks>
        <Rank position="1" eventId="3">
          <Athlete>Athlete 3a / Athlete 4a [AUT]</Athlete>
          <Result>2</Result>
        </Rank>
        <Rank position="2" eventId="3">
          <Athlete>Athlete 3b / Athlete 4b [SUI]</Athlete>
          <Result>0</Result>
        </Rank>
      </Ranks>
    </Contest>
    </Contests>
</ContestResults>

生成所需的正确结果：

<ContestResults>
   <Contests>
      <Contest sportId="35">
         <Sport>Beach Volleyball</Sport>
         <Event>Men's</Event>
         <Ranks>
            <Rank position="1" eventId="1">
               <Athlete>Athlete 1a / Athlete 2a [GER]</Athlete>
               <Result>2</Result>
            </Rank>
            <Rank position="2" eventId="1">
               <Athlete>Athlete 1b / Athlete 2b [NED]</Athlete>
               <Result>0</Result>
            </Rank>
            <Rank position="1" eventId="3">
               <Athlete>Athlete 3a / Athlete 4a [AUT]</Athlete>
               <Result>2</Result>
            </Rank>
            <Rank position="2" eventId="3">
               <Athlete>Athlete 3b / Athlete 4b [SUI]</Athlete>
               <Result>0</Result>
            </Rank>
         </Ranks>
      </Contest>
      <Contest sportId="32">
         <Sport>Tennis</Sport>
         <Event>Women's Singles</Event>
         <Ranks>
            <Rank position="1" eventId="2">
               <Athlete>Tennis Athlete 1</Athlete>
               <Result>2</Result>
            </Rank>
            <Rank position="2" eventId="2">
               <Athlete>Tennis Athlete 2</Athlete>
               <Result>1</Result>
            </Rank>
         </Ranks>
      </Contest>
   </Contests>
</ContestResults>

解释：

正确使用Muenchian分组方法并覆盖身份规则。