为什么我的 XSL 样式表 for-each 不起作用，重复文本

Question

我已经查看了可能已有您的答案部分的问题，但解决方案无效。

我是 XML 样式表的新手，我有一个 XSL 并且在我的 for each 循环中，当我试图获取标签中的所有文本时，数据不断重复。它的计数（父标签中值的数量）准确，但只打印相同的文本。

有什么想法吗？

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

     <xsl:template match="/programming/languages/language">

        <h3>=======Programming Language <xsl:value-of select="./@id" />=======</h3>
        <p>Language: <xsl:value-of select="name" /></p>

        Intended Use:
        <xsl:variable name="intendedUseID" select="purpose/intendedUse/@id" />
        <xsl:for-each select="/programming/purpose/intendedUse[@id=$intendedUseID]" >
           <xsl:value-of select="/programming/purpose/intendedUse" />
        </xsl:for-each>

        <br />

        <xsl:variable name="featureID" select="features/feature/@id" />
             <xsl:for-each select="/programming/features/feature[@id=$featureID]">
                <xsl:value-of select="/programming/features/feature" /><br />
            </xsl:for-each>
     </xsl:template>
</xsl:stylesheet>

XML

<programming>
  <languages>
    <language id="1">
      <name>C</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="2" />
        <intendedUse id="3" />
        <intendedUse id="4" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="4" />
      </features>
      <standards>
        <standard id="1" />
        <standard id="2" />
      </standards>
    </language>
    <language id="2">
      <name>C++</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="2" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="3" />
        <feature id="4" />
        <feature id="5" />
      </features>
      <standards>
        <standard id="2" />
      </standards>
    </language>
    <language id="3">
      <name>C#</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="5" />
        <intendedUse id="6" />
        <intendedUse id="7" />
        <intendedUse id="3" />
        <intendedUse id="8" />
        <intendedUse id="9" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="3" />
        <feature id="4" />
        <feature id="5" />
        <feature id="6" />
        <feature id="7" />
      </features>
      <standards>
        <standard id="3" />
        <standard id="2" />
      </standards>
    </language>
    <language id="4">
      <name>Java</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="6" />
        <intendedUse id="7" />
        <intendedUse id="3" />
        <intendedUse id="8" />
        <intendedUse id="9" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="5" />
        <feature id="6" />
      </features>
      <standards>
        <standard id="4" />
      </standards>
    </language>
    <language id="5">
      <name>JavaScript</name>
      <purpose>
        <intendedUse id="7" />
        <intendedUse id="8" />
        <intendedUse id="7" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="3" />
        <feature id="6" />
      </features>
      <standards>
        <standard id="3" />
      </standards>
    </language>
    <language id="6">
      <name>PHP</name>
      <purpose>
        <intendedUse id="8" />
        <intendedUse id="9" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="4" />
        <feature id="6" />
      </features>
      <standards>
        <standard id="5" />
      </standards>
    </language>
    <language id="7">
      <name>Python</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="3" />
        <intendedUse id="9" />
        <intendedUse id="10" />
        <intendedUse id="11" />
        <intendedUse id="12" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="3" />
        <feature id="6" />
      </features>
      <standards>
        <standard id="5" />
      </standards>
    </language>
    <language id="8">
      <name>Basic</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="13" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="4" />
      </features>
      <standards>
        <standard id="1" />
        <standard id="2" />
      </standards>
    </language>
    <language id="9">
      <name>ADA</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="2" />
        <intendedUse id="14" />
        <intendedUse id="15" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="4" />
        <feature id="5" />
      </features>
      <standards>
        <standard id="1" />
        <standard id="2" />
        <standard id="6" />
      </standards>
    </language>
    <language id="10">
      <name>ActionScript 3.0</name>
      <purpose>
        <intendedUse id="1" />
        <intendedUse id="7" />
        <intendedUse id="9" />
      </purpose>
      <features>
        <feature id="1" />
        <feature id="2" />
        <feature id="7" />
      </features>
      <standards>
        <standard id="3" />
      </standards>
    </language>
  </languages>

  <purpose>
    <intendedUse id="1"> Application</intendedUse>
    <intendedUse id="2"> System </intendedUse>
    <intendedUse id="3"> General Purpose </intendedUse>
    <intendedUse id="4"> Low-Level Operations </intendedUse>
    <intendedUse id="5"> RAD </intendedUse>
    <intendedUse id="6"> Business </intendedUse>
    <intendedUse id="7"> Client-Side </intendedUse>
    <intendedUse id="8"> Server-Side </intendedUse>
    <intendedUse id="9"> Web </intendedUse>
    <intendedUse id="10"> Scripting </intendedUse>
    <intendedUse id="11"> AI </intendedUse>
    <intendedUse id="12"> Scientific Computing </intendedUse>
    <intendedUse id="13">Education</intendedUse>
    <intendedUse id="14">Embedded</intendedUse>
    <intendedUse id="15">RealTime</intendedUse>
  </purpose>
  <features>
    <feature id="1">Imperative </feature>
    <feature id="2">Object-Oriented</feature>
    <feature id="3">Functional</feature>
    <feature id="4">Procedural</feature>
    <feature id="5">Generic</feature>
    <feature id="6">Reflective</feature>
    <feature id="7">Event-Driven</feature>
  </features>
  <standards>
    <standard id="1">ANSI</standard>
    <standard id="2">ISO</standard>
    <standard id="3">ECMA</standard>
    <standard id="4">DE FACTO</standard>
    <standard id="5">NO</standard>
    <standard id="6">GOST</standard>
  </standards>
</programming>

这是打印出来的

=======编程语言1=======

语言：C

预期用途：应用程序应用程序应用程序至关重要的命令式

=======编程语言2=======

语言：C++

预期用途：应用程序

势在必行至关重要的至关重要的至关重要的势在必行

Answer 1

第一件事：

<xsl:for-each select="/programming/purpose/intendedUse[@id=$intendedUseID]" >

将您置于 intendedUse 的背景下。从这个上下文中，您只需要通过执行以下操作来获取当前节点的值：

<xsl:value-of select="." />

你的方式：

<xsl:value-of select="/programming/purpose/intendedUse" />

返回根并选择此路径上的第一个节点。

第二件事是，当您的第一个也是唯一一个模板在输入树的中间开始时，更高层的节点及其后代将由 built-in template rules 处理。

结果，您将在结果中积累大量垃圾文本，因为默认情况下，所有文本节点都被复制到输出树。你应该让你的第一个模板匹配根节点：

<xsl:template match="/">

并更改包含的路径以从那里开始。

最后，您应该考虑使用 keys 从文档的其他分支查找数据：它也更整洁、更高效。

为什么我的 XSL 样式表 for-each 不起作用，重复文本

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xls