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Re: Nested/embedded/self-referential path expressions.

Subject: Re: Nested/embedded/self-referential path expressions.
From: Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>
Date: Thu, 11 Jul 2002 21:20:08 +0100
nested el expression
Hi Ed,

> What I want to do is combine the if with the "match=..." clause of
> the template. The problem is that I need to reference the "name()"
> of the context/element with the "name()" in a different
> context/element. The logical expression would be somethink like the
> following:
>
> <xsl:template match="Row/*[/Table/Columns/*[{inner context name}={outer
> context name}]]">
>
> Can/how do I reference a element/component of the outer context for
> comparison in the inner context?

You can't. One method you can use in this situation, though, is to
define a key that can get you from a name to a column (child of the
Columns element):

<xsl:key name="columns" match="/Table/Columns/*" use="name()" />

Then you can do:

<xsl:template match="Row/*[key('columns', name())]">
  ...
</xsl:template>

In general it's a bad idea to use complicated conditions like this
within patterns; you'd probably be better off having a general
template for all elements within Row elements, but only applying
templates to those that share a name with a column:

<xsl:template match="Row">
  <xsl:apply-templates select="*[key('columns', name())]" />
</xsl:template>

<xsl:template match="Row/*">
  ...
</xsl:template>

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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