xslt - XSLT-如何包装具有特定属性的相邻元素

Question

我是xsl的新手。我发现了类似的东西，但不能完全调整为我的用途。

输入:

<section>
  <heading>some heading text</heading>
  <amendment chapter="1">
    <foo/>
  </amendment>
  <amendment chapter="2">
    <bar/>
  </amendment>
  <amendment chapter="3">
    <baz/>
  </amendment>
  <heading>some heading text</heading>
  <amendment chapter="1">
    <baz/>
  </amendment>
</section>

包装属性为“chapter ='1'或Chapter ='2'”的元素。
输出:

<section>
  <heading>some heading text</heading>
  <newwrapper>
    <amendment chapter="1">
      <foo/>
    </amendment>
    <amendment chapter="2">
      <bar/>
    </amendment>
  </newwrapper>
  <amendment chapter="3">
    <baz/>
  </amendment>
  <heading>some heading text</heading>
  <newwrapper>
    <amendment chapter="1">
      <baz/>
    </amendment>
  </newwrapper>
</section>

Answer 1

I.此XSLT 2.0转换:

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:template match="/*">
   <section>
    <xsl:for-each-group select="*" 
                        group-adjacent="self::amendment and @chapter =(1,2)">
     <xsl:choose>
       <xsl:when test="current-grouping-key()">
         <newwrapper>
           <xsl:sequence select="current-group()"/>
         </newwrapper>
       </xsl:when>
       <xsl:otherwise>
         <xsl:sequence select="current-group()"/>
       </xsl:otherwise>
     </xsl:choose>
    </xsl:for-each-group>
  </section>
 </xsl:template>
</xsl:stylesheet>

应用于提供的XML文档时 :

<section>
    <heading>some heading text</heading>
    <amendment chapter="1">
        <foo/>
    </amendment>
    <amendment chapter="2">
        <bar/>
    </amendment>
    <amendment chapter="3">
        <baz/>
    </amendment>
    <heading>some heading text</heading>
    <amendment chapter="1">
        <baz/>
    </amendment>
</section>

产生所需的正确结果:

<section>
   <heading>some heading text</heading>
   <newwrapper>
      <amendment chapter="1">
               <foo/>
         </amendment>
      <amendment chapter="2">
               <bar/>
         </amendment>
   </newwrapper>
   <amendment chapter="3">
            <baz/>
      </amendment>
   <heading>some heading text</heading>
   <newwrapper>
      <amendment chapter="1">
               <baz/>
         </amendment>
   </newwrapper>
</section>

解释:

正确使用 xsl:for-each-group属性的 group-adjacent 。

II。 XSLT 1.0解决方案:

<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="kFollowing" match="amendment[not(@chapter >2)]" use=
 "generate-id(preceding-sibling::*
                [not(self::amendment and @chapter &lt;= 2)][1])"/>

 <xsl:template match="node()|@*" name="identity">
     <xsl:copy>
       <xsl:apply-templates select="node()|@*"/>
     </xsl:copy>
 </xsl:template>


 <xsl:template match=
 "*[not(self::amendment and @chapter &lt;= 2)
  and
    following-sibling::*[1][self::amendment and not(@chapter >2)]
    ]">
  <xsl:call-template name="identity"/>
  <newwrapper>
   <xsl:apply-templates mode="inGroup"
                        select="key('kFollowing', generate-id())"/>
  </newwrapper>
 </xsl:template>

 <xsl:template match="*" mode="inGroup">
  <xsl:call-template name="identity"/>
 </xsl:template>
 <xsl:template match="amendment[not(@chapter >2)]"/>
</xsl:stylesheet>

当此转换应用于相同的XML文档(如上)时，将产生相同，正确的结果。

解释:

正确使用:

使用和覆盖 identity rule 。

Keys 来定义一组相邻的amendment元素，这些元素的chapter属性不大于2，这是该组前一个兄弟元素的 generate-id() 的函数。