如何在 xsl:apply-templates 中使用 XSL 变量? [英] How to use XSL variable in xsl:apply-templates?

问题描述

我对 xsl:apply-templates 的调用相当复杂:

I have a reasonably complex call to xsl:apply-templates:

<xsl:apply-templates select="columnval[@id 
                                       and not(@id='_Name_') 
                                       and not(@id='Group') 
                                       and not(@id='_Count_')]"/>

该表达式在其他地方重复使用，如下所示:

The expression is reused in other places like this:

<xsl:apply-templates select="someothernode[@id 
                                           and not(@id='_Name_') 
                                           and not(@id='Group') 
                                           and not(@id='_Count_')]"/>

我想以某种方式概括它，所以我可以定义一次并在其他地方重用它.但是，这似乎不起作用:

I want to generalize it somehow, so I can define it once and reuse it elsewhere. However, this doesn't seem to work:

<xsl:variable name="x">@id and not(@id='_Name_') and not(@id='Group') and not(@id='_Count_')</xsl:variable>
<xsl:apply-templates select="columnval[$x]"/>
<xsl:apply-templates select="someothernode[$x]"/>

有没有更好/不同的方法来做到这一点?我想要的只是在对 xsl:apply-templates 的多个不同调用中重用 xpath 表达式(其中一些从不同的子项中选择).

Is there a better / different way of doing this? All I want is to reuse the xpath expression in multiple different calls to xsl:apply-templates (some of which select from different children).

这将在客户端应用程序中使用，因此很遗憾我无法使用任何扩展或切换到 XSLT 2.:(

This is going to be used in a client application, so I can't use any extensions or switch to XSLT 2 unfortunately. :(

谢谢.

推荐答案

您不能在 XSLT(至少，不是 XSLT 1.0)中动态构造 XPath.但是您可以使用模板模式轻松完成您想要做的事情:

You can't construct XPath dynamically in XSLT (at least, not XSLT 1.0). But you can easily accomplish what you're trying to do using template modes:

<xsl:apply-templates select="columnval" mode="filter"/>
<xsl:apply-template select="someothernode" mode="filter"/>

...

<!-- this guarantees that elements that don't match the filter don't get output -->
<xsl:template match="*" mode="filter"/>

<xsl:template match="*[@id and not(@id='_Name_') and not(@id='Group') and not(@id='_Count_')]" mode="filter">
   <xsl:apply-templates select="." mode="filtered"/>
</xsl:template>

<xsl:template match="columnval" mode="filtered">
   <!-- this will only be applied to the columnval elements that pass the filter -->
</xsl:template>

<xsl:template match="someothernode" mode="filtered">
   <!-- this will only be applied to the someothernode elements that pass the filter -->
</xsl:template>

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