我已在 .xsl 文件中声明了一个变量。现在我想用新值更新旧值。例如：
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
<xsl:output method="html" indent="yes"/>
<xsl:template match="/">
<Document>
<xsl:variable name="topLevelHeadings" select = "//w:body/w:p[w:pPr[w:pStyle[@w:val='Heading1']]]"/>
<xsl:variable name="beforeHeading" select="false()"/>
<xsl:choose>
<xsl:when test="$beforeHeading">
<xsl:apply-templates select="//w:body/w:p">
<xsl:with-param name="scope" select="count(//w:body/child::*)-1"/>
</xsl:apply-templates>
</xsl:when>
<xsl:when test="$topLevelHeadings">
<xsl:variable name="beforeHeading" select="true()"/>
<xsl:apply-templates select="$topLevelHeadings">
<xsl:with-param name="scope" select="count(//w:body/child::*)-1"/>
</xsl:apply-templates>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="//w:body/w:p[w:r[w:t]]">
<xsl:with-param name="scope" select="count(//w:body/child::*)-1"/>
</xsl:apply-templates>
</xsl:otherwise>
</xsl:choose>
</Document>
</xsl:template>
<xsl:template match="w:body/w:p">
<xsl:param name = "scope"/>
<xsl:variable name ="index" select="count(preceding-sibling::*)"/>
<xsl:if test = "$index <= $scope">
<Paragraph>
<xsl:attribute name="index">
<xsl:value-of select="$index" />
</xsl:attribute>
<xsl:apply-templates select=".//w:r/w:t"/>
</Paragraph>
</xsl:if>
</xsl:template>
<xsl:template match="w:t">
<xsl:value-of select="."/>
</xsl:template>
<xsl:template match="w:body/w:p">
<xsl:param name = "scope"/>
<xsl:variable name ="index" select="count(preceding-sibling::*)"/>
<xsl:if test = "$index <= $scope">
<Paragraph>
<xsl:attribute name="index">
<xsl:value-of select="$index" />
</xsl:attribute>
<xsl:apply-templates select=".//w:r/w:t"/>
</Paragraph>
</xsl:if>
</xsl:template>
<xsl:template name="get-para-index">
<xsl:param name="node"/>
<xsl:value-of select="count($node/preceding-sibling::*)"/>
</xsl:template>
<xsl:template match="//w:body/w:p[w:pPr[w:pStyle]]">
<xsl:param name = "scope"/>
<xsl:variable name="currIndex" select="count(preceding-sibling::*)"/>
<xsl:if test="$currIndex <= $scope">
<!-- Get current heading value -->
<xsl:variable name="currHeading" select="./w:pPr/w:pStyle/@w:val"/>
<!-- Heading tag -->
<xsl:element name="{$currHeading}">
<!-- Get heading text -->
<Title>
<xsl:attribute name ="index">
<xsl:value-of select="$currIndex"/>
</xsl:attribute>
<xsl:apply-templates select=".//w:r/w:t"/>
</Title>
<!-- Get the scope of paragraphs inside this heading -->
<xsl:variable name="nextHeading" select="following-sibling::w:p[w:pPr[w:pStyle[@w:val]]][1]"/>
<xsl:variable name="paraScope">
<xsl:choose>
<xsl:when test="$nextHeading">
<xsl:call-template name="get-para-index">
<xsl:with-param name="node" select="$nextHeading"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="count(//w:body/child::*)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<!-- Handle paragraphs under this heading -->
<xsl:apply-templates select="following-sibling::w:p[//w:r and not(w:pPr[w:pStyle])]">
<xsl:with-param name="scope" select="$paraScope"/>
</xsl:apply-templates>
<!-- Get the first heading after current node at the same level -->
<xsl:variable name="nextSibling" select="following-sibling::w:p[w:pPr[w:pStyle[@w:val=$currHeading]]][1]"/>
<!-- Get its index -->
<xsl:variable name="nextSiblingIndex">
<xsl:choose>
<xsl:when test="$nextSibling">
<xsl:call-template name="get-para-index">
<xsl:with-param name="node" select="$nextSibling"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$scope"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<!-- Set the scope of this node - this will be the smaller of nextSiblingIndex and current scope -->
<xsl:variable name="currScope">
<xsl:choose>
<xsl:when test="$nextSiblingIndex < $scope">
<xsl:value-of select="$nextSiblingIndex"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$scope"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="nextHead" select="concat('Heading', number(substring-after($currHeading, 'Heading'))+1)"/>
<!-- Get a list of child nodes (headings) for the current node -->
<xsl:variable name="nextLevelHeadings" select="following-sibling::w:p[w:pPr[w:pStyle[@w:val=$nextHead]]]"/>
<!-- Apply recursively for next level headings within the scope -->
<xsl:apply-templates select="$nextLevelHeadings">
<xsl:with-param name="scope" select="$currScope"/>
</xsl:apply-templates>
<!-- Close heading tag -->
</xsl:element>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
如果您恰好在转换中需要这样的行为，则意味着您可能必须更改它的整体“设计”。如果不显示输入文档和所需的输出，也很难获得您想要执行的操作。
因为您无法更新变量，所以您必须重新考虑您的代码。最接近您的要求的模式（我能想象）是这样的：
<xsl:template match="/">
<xsl:variable name="topLevelHeadings" select="//w:body/w:p
[w:pPr[w:pStyle[@w:val='Heading1']]]"/>
<xsl:variable name="beforeHeading">
<xsl:choose>
<xsl:when test="$topLevelHeadings">
<xsl:value-of select="true()"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="false()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<!-- your choose staff -->
<!-- for instance -->
<xsl:if test="$beforeHeading='true'">
<xsl:message>pass</xsl:message>
</xsl:if>
</xsl:template>
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