如何在XSLT中使用preceding-sibling限制for-each，仅读取x=0元素前的内容？

Your current XSLT code has a couple of issues with the XPath logic that's preventing it from working correctly. Let's fix that and break down what's going on.

Correct XSLT Code (XSLT 1.0 Compatible) #

Here's a working snippet that selects all elements inside <g id='NOCUT'> that appear before the first <line x="0.0"/>:

<xsl:template match="/">
  <!-- Target the specific g element first -->
  <xsl:for-each select="svg/g[@id='NOCUT']/*[not(preceding-sibling::line[@x='0.0'])]">
    <!-- Replace this with your processing logic -->
    <xsl:copy-of select="."/>
  </xsl:for-each>
</xsl:template>

Why Your Original Code Failed #

Let's look at the key problems in your approach:

• Incorrect Context in the Second for-each: When you use <xsl:for-each select="svg[g/@id='NOCUT']">, the context becomes the <svg> element. Your second for-each uses g/*, which would select all children of all <g> elements in the <svg>—but you should be targeting only the <g> with id='NOCUT' using *g[@id='NOCUT']/**.
• Wrong Predicate Logic: The predicate *preceding-sibling::node[line/@x = '0.0']* is looking for a preceding sibling node that has a <line> child with x='0.0'. But the <line x="0.0"/> is a direct sibling element, not a child of another sibling node. Instead, you need to check if the current element does not have any preceding sibling <line> with x='0.0' (which is what *not(preceding-sibling::line[@x='0.0'])* does).

For XSLT 2.0+ Users (More Readable) #

If you're using a processor that supports XSLT 2.0 or higher, you can use the *<<* operator (document order comparison) for a more intuitive query:

<xsl:template match="/">
  <xsl:variable name="target-line" select="svg/g[@id='NOCUT']/line[@x='0.0'][1]"/>
  <xsl:for-each select="svg/g[@id='NOCUT']/*[. << $target-line]">
    <!-- Your processing here -->
    <xsl:copy-of select="."/>
  </xsl:for-each>
</xsl:template>

This first stores the first occurrence of <line x="0.0"/> in a variable, then selects all elements that come before it in document order.

Edge Cases to Consider #

• If there's no <line x="0.0"/> in the <g id='NOCUT'>, both approaches will select all child elements of the <g>.
• If there are multiple <line x="0.0"/> elements, both approaches will only select elements before the first occurrence (which is likely what you want).

内容的提问来源于stack exchange，提问作者HarsH