用于distinct

编程入门行业动态更新时间:2024-10-10 02:22:24

用于distinct-values的XSLT 1.0变体(XSLT 1.0 variant for distinct-values)

我有一个XSLT，我在其中创建（来自输入数据）中间变量，如下所示（硬编码示例，但本质上是动态的）：

<xsl:variable name="variableX"> <ValidCode CodePart="CP1" Code="C1"/> <ValidCode CodePart="CP2" Code="C2"/> <ValidCode CodePart="CP1" Code="C3"/> <ValidCode CodePart="CP2" Code="C4"/> <ValidCode CodePart="CP2" Code="C5"/> </xsl:variable>

我希望循环出现不同的CodePart值。在XSLT 2.0中，它很容易：

<xsl:for-each select="distinct-values($variableX/ValidCode/@CodePart)">...</xsl:for-each>

但是在XSLT 1.0中如何做到这一点呢？请注意，我不能使用密钥，因为它是动态确定的变量而不是输入文件的一部分。

我的输入文件包含所有可能代码部分的列表，如下所示：

所以我想到了循环//CodePart/value ，确保了初学者的独特性。但后来我需要一些包含条件的Xpath表达式

“值出现在所有$ variableX / ValidCode / @ CodePart值的节点集中”

并使用类似的东西

<xsl:for-each select="//CodePart[..condition..]/value">...</xsl:for-each>

我正在寻找一种简单形式的Xpath表达式吗？或者另一种方法更可取？

I have an XSLT in which I create (from the input data) intermediary variables like the following (hard-coded example, but dynamic in nature):

I wish to loop over the distinct occurrences of CodePart values. In XSLT 2.0 it's easy:

<xsl:for-each select="distinct-values($variableX/ValidCode/@CodePart)">...</xsl:for-each>

But how best do this in XSLT 1.0? Note that I can't use a key, as it's a dynamically determined variable and not part of the input file.

My input file does contain a list of all possible code parts as follows:

So I thought of looping over //CodePart/value instead, ensuring uniqueness for starters. But then I need some Xpath expression that includes the condition

"value occurs in the node-set of all $variableX/ValidCode/@CodePart values"

and use something like

<xsl:for-each select="//CodePart[..condition..]/value">...</xsl:for-each>

Is there a simple form of the Xpath expression I am looking for? Or is another approach preferable?

最满意答案

我不认为你可以直接使用XPath - 但你应该只能检查这样的有效值：

<xsl:for-each select="//CodePart/value"> <xsl:variable name="CodePart" select="."/> <xsl:if test="$variableX/ValidCode[@CodePart=$CodePart]"> . . . </xsl:if> </xsl:for-each>

或更简单（感谢评论）：

<xsl:for-each select="//CodePart/value"> <xsl:if test="$variableX/ValidCode[@CodePart=current()]"> . . . </xsl:if> </xsl:for-each>

如果$variableX不是节点集而是XML片段，则需要将其转换为节点集 - 这是依赖于实现的，使用Microsoft处理器：

<xsl:for-each select="//CodePart/value" xmlns:msxsl="urn:schemas-microsoft-com:xslt"> <xsl:if test="msxsl:node-set($variableX)/ValidCode[@CodePart=current()]"> . . . </xsl:if> </xsl:for-each>

I don't think you can use directly an XPath - but you should be able to check for only the valid values like this:

<xsl:for-each select="//CodePart/value"> <xsl:variable name="CodePart" select="."/> <xsl:if test="$variableX/ValidCode[@CodePart=$CodePart]"> . . . </xsl:if> </xsl:for-each>

or more simply (thanks to the comments):

<xsl:for-each select="//CodePart/value"> <xsl:if test="$variableX/ValidCode[@CodePart=current()]"> . . . </xsl:if> </xsl:for-each>

If $variableX is not a node set but an XML fragment it needs to be converted to a node set - this is implementation-dependent, using Microsoft processors:

<xsl:for-each select="//CodePart/value" xmlns:msxsl="urn:schemas-microsoft-com:xslt"> <xsl:if test="msxsl:node-set($variableX)/ValidCode[@CodePart=current()]"> . . . </xsl:if> </xsl:for-each>

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