如何使用XSL抓取匹配兄弟节点的元素？附XML示例

First, here's your XML structure (cleaned up for clarity):

<?xml version="1.0" encoding="UTF-8"?>
<batch>
  <batchnummer>782</batchnummer>
  <continueonerror>true</continueonerror>
  <metafileversion>1.0</metafileversion>
  <documentset>
    <naam></naam>
    <type></type>
    <subsets>
      <subset>
        <staple>true</staple>
        <subdocuments>
          <subdocument>
            <document>thr6UhEw5bER6Cjt8uKOCg</document>
            <stamp></stamp>
            <!-- Truncated content -->
          </subdocument>
        </subdocuments>
      </subset>
    </subsets>
  </documentset>
</batch>

Depending on exactly which siblings you need to target, here are the most common approaches in XSLT:

Target the immediate next sibling #

If you want to get the <stamp> element that directly follows <document>, use the following-sibling axis. You can either target it specifically or grab the first sibling:

<!-- When matching a <document> element, get its <stamp> sibling -->
<xsl:template match="document">
  <!-- Explicitly select the stamp sibling -->
  <xsl:value-of select="following-sibling::stamp"/>
  
  <!-- Or grab the very next sibling regardless of tag name -->
  <!-- <xsl:value-of select="following-sibling::*[1]"/> -->
</xsl:template>

Target the immediate previous sibling #

To fetch an element that comes right before another (like getting <document> when you're on <stamp>), use the preceding-sibling axis:

<xsl:template match="stamp">
  <!-- Get the document element that's the immediate prior sibling -->
  <xsl:value-of select="preceding-sibling::document"/>
</xsl:template>

Select all siblings of a specific type #

If you need to process all <subdocument> elements under the same <subdocuments> parent (they're siblings of each other), you can directly select them from the parent node:

<xsl:template match="subdocuments">
  <xsl:for-each select="subdocument">
    <!-- Process each subdocument sibling -->
    <div>Document ID: <xsl:value-of select="document"/></div>
  </xsl:for-each>
</xsl:template>

Filter siblings by a condition #

You can also narrow down siblings using predicates. For example, get all <subset> elements where the <staple> child is true:

<xsl:template match="subsets">
  <xsl:for-each select="subset[staple='true']">
    <!-- Process only subsets with staple enabled -->
    <xsl:value-of select="subdocuments/subdocument/document"/>
  </xsl:for-each>
</xsl:template>

The key thing to remember is that following-sibling and preceding-sibling axes only target elements at the same hierarchy level as your current context node. Make sure you're positioned correctly in the XML tree when using these!

内容的提问来源于stack exchange，提问作者Patrick Rennings