嵌套 XSL 问题 apply-templates

Question

我正在尝试使用 xsl 将 xml 文件转换为 html。有一次我需要从特定标签（具有相同的嵌套结构）填充标题列表。

下面是我的 xml 文件的一部分。

<description>
    <levelledPara>
        <title>Heading [1]</title>
        <para>Contains paragraph items</para>
        <levelledPara>
            <title>Heading [1.1]</title>
            <para>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</para>
        </levelledPara>
        <levelledPara>
            <title>Heading [1.2]</title>
            <para>Fusce aliquet pede non pede</para>
        </levelledPara>
        <levelledPara>
            <title>Heading [1.3]</title>
            <para>Suspendisse dui purus, scelerisque at, vulputate vitae, pretium mattis, nunc.</para></levelledPara>
        <levelledPara>
            <title>Heading [1.4]</title>
            <para>Aenean nec lorem. In porttitor. Donec laoreet nonummy augue.</para>
            <levelledPara>
                <title>Heading [1.4.1]</title>
                <para>Pellentesque porttitor, velit lacinia egestas auctor</para>
            </levelledPara>
                <levelledPara>
                <title>Heading [1.4.2]</title>
                <para>Pellentesque porttitor, velit lacinia egestas auctor</para>
            </levelledPara>
            <levelledPara>
                <title>Heading [1.4.3]</title>
                <para>Fusce aliquet pede non pede. Suspendisse dapibus lorem pellentesque magna. </para>
                <levelledPara>
                    <title>Heading [1.4.3.1]</title>
                    <para>Proin semper, ante vitae sollicitudin posuere, metus quam iaculis nibh.</para>
                    <levelledPara>
                        <title>Heading [1.4.3.1.1]</title>
                        <para>Ut tincidunt volutpat urna. Mauris eleifend nulla eget mauris.</para>
                    </levelledPara>
                    <levelledPara>
                        <title>Heading [1.4.3.1.2]</title>
                        <para>Ut tincidunt volutpat urna.</para>
                </levelledPara>
                </levelledPara>
                <levelledPara>
                    <title>Heading [1.4.3.2]</title>
                    <para>Proin semper, ante vitae sollicitudin posuere.</para>
                </levelledPara>
                <levelledPara>
                    <title>Heading [1.4.3.3]</title>
                    <para>Proin semper, ante vitae sollicitudin posuere.</para>
                </levelledPara>
                <levelledPara>
                    <title>Heading [1.4.3.4]</title>
                    <para>Proin semper, ante vitae sollicitudin posuere.</para>
                </levelledPara>
            </levelledPara>
            <levelledPara>
                <title>Heading [1.4.4]</title>
                <para>In hac habitasse platea dictumst.</para>
            </levelledPara>
            <levelledPara>
                <title>Heading [1.4.5]</title>
                <para>Quisque ornare placerat risus.</para>
            </levelledPara>
        </levelledPara>
        <levelledPara>
            <title>Heading [1.5]</title>
            <para> Sed aliquam odio vitae tortor. Proin hendrerit tempus arcu.</para>
        </levelledPara>
        <levelledPara>
            <title>Heading [1.6]</title>
            <para>Vivamus a mi. Morbi neque.</para>
        </levelledPara>
    </levelledPara>
    <levelledPara>
        <title>Heading [2]</title>
        <para>Proin semper, ante vitae sollicitudin posuere.</para>
    </levelledPara>
    <levelledPara>
        <title>Heading [3]</title>
        <para>Etiam at ligula et tellus ullamcorper ultrices.</para>
    </levelledPara>
</description>

XSL 代码：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    exclude-result-prefixes="xs"
    version="2.0">
    <xsl:output method="html"></xsl:output>

    <xsl:template match="/">

         ...
            <body>
                ...

                <nav><ul><xsl:apply-templates select="//levelledPara" mode="toc"/></ul></nav>

                ...
            </body>

        ... 

<xsl:template match="levelledPara" mode="toc">
    <li>
    <xsl:value-of select="title"/>
    <xsl:if test="levelledPara">
        <ul>
        <xsl:apply-templates select="levelledPara" mode="toc"/>
        </ul>
        </xsl:if>
    </li>
</xsl:template>

期望的输出：

  <nav>
     <ul>
        <li>Heading [1]
           <ul>
              <li>Heading [1.1]</li>
              <li>Heading [1.2]</li>
              <li>Heading [1.3]</li>
              <li>Heading [1.4]
                 <ul>
                    <li>Heading [1.4.1]</li>
                    <li>Heading [1.4.2]</li>
                    <li>Heading [1.4.3]
                       <ul>
                          <li>Heading [1.4.3.1]
                             <ul>
                                <li>Heading [1.4.3.1.1]</li>
                                <li>Heading [1.4.3.1.2]</li>
                             </ul>
                          </li>
                          <li>Heading [1.4.3.2]</li>
                          <li>Heading [1.4.3.3]</li>
                          <li>Heading [1.4.3.4]</li>
                       </ul>
                    </li>
                    <li>Heading [1.4.4]</li>
                    <li>Heading [1.4.5]</li>
                 </ul>
              </li>
              <li>Heading [1.5]</li>
              <li>Heading [1.6]</li>
           </ul>
        </li>
        <li>Heading [2]</li>
        <li>Heading [3]</li>
     </ul>
  </nav>

实际输出：

  <nav>
     <ul>
        <li>Heading [1]
           <ul>
              <li>Heading [1.1]</li>
              <li>Heading [1.2]</li>
              <li>Heading [1.3]</li>
              <li>Heading [1.4]
                 <ul>
                    <li>Heading [1.4.1]</li>
                    <li>Heading [1.4.2]</li>
                    <li>Heading [1.4.3]
                       <ul>
                          <li>Heading [1.4.3.1]
                             <ul>
                                <li>Heading [1.4.3.1.1]</li>
                                <li>Heading [1.4.3.1.2]</li>
                             </ul>
                          </li>
                          <li>Heading [1.4.3.2]</li>
                          <li>Heading [1.4.3.3]</li>
                          <li>Heading [1.4.3.4]</li>
                       </ul>
                    </li>
                    <li>Heading [1.4.4]</li>
                    <li>Heading [1.4.5]</li>
                 </ul>
              </li>
              <li>Heading [1.5]</li>
              <li>Heading [1.6]</li>
           </ul>
        </li>
        <li>Heading [1.1]</li>
        <li>Heading [1.2]</li>
        <li>Heading [1.3]</li>
        <li>Heading [1.4]
           <ul>
              <li>Heading [1.4.1]</li>
              <li>Heading [1.4.2]</li>
              <li>Heading [1.4.3]
                 <ul>
                    <li>Heading [1.4.3.1]
                       <ul>
                          <li>Heading [1.4.3.1.1]</li>
                          <li>Heading [1.4.3.1.2]</li>
                       </ul>
                    </li>
                    <li>Heading [1.4.3.2]</li>
                    <li>Heading [1.4.3.3]</li>
                    <li>Heading [1.4.3.4]</li>
                 </ul>
              </li>
              <li>Heading [1.4.4]</li>
              <li>Heading [1.4.5]</li>
           </ul>
        </li>
        <li>Heading [1.4.1]</li>
        <li>Heading [1.4.2]</li>
        <li>Heading [1.4.3]
           <ul>
              <li>Heading [1.4.3.1]
                 <ul>
                    <li>Heading [1.4.3.1.1]</li>
                    <li>Heading [1.4.3.1.2]</li>
                 </ul>
              </li>
              <li>Heading [1.4.3.2]</li>
              <li>Heading [1.4.3.3]</li>
              <li>Heading [1.4.3.4]</li>
           </ul>
        </li>
        <li>Heading [1.4.3.1]
           <ul>
              <li>Heading [1.4.3.1.1]</li>
              <li>Heading [1.4.3.1.2]</li>
           </ul>
        </li>
        <li>Heading [1.4.3.1.1]</li>
        <li>Heading [1.4.3.1.2]</li>
        <li>Heading [1.4.3.2]</li>
        <li>Heading [1.4.3.3]</li>
        <li>Heading [1.4.3.4]</li>
        <li>Heading [1.4.4]</li>
        <li>Heading [1.4.5]</li>
        <li>Heading [1.5]</li>
        <li>Heading [1.6]</li>
        <li>Heading [2]</li>
        <li>Heading [3]</li>
     </ul>
  </nav>

似乎对整个嵌套内容一遍又一遍地应用了模板。我不知道这里可能是什么问题。

Answer 1

看来你只需要 select

            <nav><ul><xsl:apply-templates select="/description/levelledPara" mode="toc"/></ul></nav>

对于第一个处理步骤，您的其他模板负责嵌套元素的递归处理。

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