查找每两个处理指令之间的所有 XML 节点 [英] Finding all XML nodes between each two processing instructions

问题描述

使用 XPath 或 XSLT 1.0，我需要找到处理指令 和 之间的每个节点..代码如下:

Using XPath or XSLT 1.0, I need to find each node between processing instructions <?start?> and <?end?>. The following code:

//node()[preceding-sibling::processing-instruction()[self::processing-instruction('start')] 
following-sibling::processing-instruction()[ self::processing-instruction('end')]]`, 

工作，但自然地，它只选择第一个 PI 和最后一个 PI 之间的节点.有没有办法只选择每个开始 - 结束对之间的节点?

works, but naturally, it only selects nodes between the first PI and the last PI. Is there any way how to select only the nodes that are between each start - end pair?

<root>
    abc

<?start?>def<Highlighted
    bold="yes"><Highlighted italic="yes">ghi</Highlighted></Highlighted>jkl
    <?pi?>
    <table>
      <Caption>stu</Caption>
    </table>vw

<?end?>
xy<?start?> 
abc <Caption>def</Caption> ghi<?end?> jkl
</root>

推荐答案

这是一个 XSLT 2.0 示例，它使用 for-each-group group-starting-with/group-ending-with 来查找并输出这些处理指令对之间的节点:

Here is an XSLT 2.0 example that uses for-each-group group-starting-with/group-ending-with to find and output the nodes between those pairs of processing instructions:

<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 indent="yes"/>

<xsl:template match="root">
    <xsl:for-each-group select="node()" group-starting-with="processing-instruction('start')">
        <xsl:if test="self::processing-instruction('start')">
            <group>
                <xsl:for-each-group select="current-group() except ." group-ending-with="processing-instruction('end')">
                    <xsl:sequence select="current-group()[position() ne last()]"/>
                </xsl:for-each-group>
            </group>
        </xsl:if>
    </xsl:for-each-group>
</xsl:template>

</xsl:stylesheet>

样品的结果是

<group>def<Highlighted bold="yes">
      <Highlighted italic="yes">ghi</Highlighted>
   </Highlighted>jkl
    <?pi?>
    <table>
        <Caption>stu</Caption>
    </table>vw

    </group>
<group> 
    abc <Caption>def</Caption> ghi</group>

使用 XSLT 1.0，您可以计算 start pi 之后和 end pi 之前的节点的交集:

Using XSLT 1.0 you can compute the intersection of nodes following the start pi and preceding the end pi:

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

    <xsl:output indent="yes"/>

    <xsl:key name="start" match="root/node()[not(self::processing-instruction('start'))]" use="generate-id(preceding-sibling::processing-instruction('start')[1])"/>
    <xsl:key name="end" match="root/node()[not(self::processing-instruction('end'))]" use="generate-id(following-sibling::processing-instruction('end')[1])"/>

    <xsl:template match="root">
        <xsl:apply-templates select="processing-instruction('start')"/>
    </xsl:template>

    <xsl:template match="processing-instruction('start')">
        <xsl:variable name="end" select="following-sibling::processing-instruction('end')[1]"/>
        <xsl:variable name="following-start" select="key('start', generate-id())"/>
        <xsl:variable name="preceding-end" select="key('end', generate-id($end))"/>
        <xsl:variable name="intersect" select="$following-start[count(. | $preceding-end) = count($preceding-end)]"/>
        <group>
            <xsl:copy-of select="$intersect"/>
        </group>
    </xsl:template>
</xsl:stylesheet>

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