Re: [xsl] Variable in XPath

Subject: Re: [xsl] Variable in XPath
From: "Andrew Welch" <andrew.j.welch@xxxxxxxxx>
Date: Wed, 27 Jun 2007 15:55:22 +0100
On 6/27/07, Garvin Riensche <g.riensche@xxxxxxx> wrote:

I hope that anyone can help me with the following. I want to write a
stylesheet that is used to check if an element (class) with a special ID
which is given as variable from the commandline exists in the source or
not. If no variable is supplied I want to test if there are "class"
nodes at all. Of course it's no problem to check if a node with a
special ID exists or not. But what do I use as default value of the
variable so that all "class" nodes are selected if no variable is supplied.

(not working) example:
   <class id="2" owner="1" name="A"/>
   <class id="3" owner="1" name="B"/>


<xsl:variable name="id" select="attribute::*"/>

<xsl:template match="//condition/and-condition">
<xsl:when test="doc('factbase.xml')/facts/class[@id eq $id]">

The test should be true if $id is set to "2" or "3" and if $id is not
set at all. So, the key is the comparison "@id eq $id" and the default
value of $id. "attribute::*" as default value is obviously wrong. Which
default value do I have to use to test if class nodes exist at all?

Seems like a long-winded way of just saying you want to check if <class> exists:

<xsl:when test="doc('factbase.xml')/facts/class">

If you then want to do something specific if the @id eq $id then add a
condition inside the xsl:when.

A case of wood-for-the-trees? (or one too many beers for me at lunch?)


Current Thread