Re: [xsl] problem with Xpath in Variable filled by choose

Subject: Re: [xsl] problem with Xpath in Variable filled by choose
From: David Carlisle <davidc@xxxxxxxxx>
Date: Wed, 16 Nov 2005 16:48:08 GMT
  <xsl:variable name="CategoryPointer"> 
                 <xsl:choose> 
                      <xsl:when test="$category = 'main'"> 
                           <xsl:copy-of 
  select="document('style.xml')/root/DeviceParameters/DesignMood/Category/main
  "/>           
                      </xsl:when> 

Note that's a relatively expensive way of setting things up as it imples
_copying_ the selected tree. 

If xsl:variiabel is used with no as= attribute it always generates a new
tree with a new document node (/)

In this case the child of / will be either a main element or a news
element depending on the test.

So this
            <xsl:value-of select="$CategoryPointer/HeadlineColor"/> 
will never select anything as the child of $CategoryPointer is never a
HeadlineColor element. It is either a main element (from the first
branch) or a text node (from the second branch)


I suspect you actually just want the variable to refererence in to nodes
in your input tree rather than to copies, so:


<xsl:variable name="CategoryPointer" as="element()"> 
                 <xsl:choose> 
                      <xsl:when test="$category = 'main'"> 
                           <xsl:sequence
select="document('style.xml')/root/DeviceParameters/DesignMood/Category/main
"/>           
                      </xsl:when> 
                      <xsl:when test="$category = 'news'"> 
                           <xsl:sequence
select="document('style.xml')/root/DeviceParameters/DesignMood/Category/news
"/>                
                      </xsl:when> 
                 </xsl:choose> 
            </xsl:variable> 


or equivalently the less verbose form:

<xsl:variable name="CategoryPointer" 
 select="document('style.xml')/root/DeviceParameters/DesignMood/Category/*[name()=$category]"/>


David

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