RE: variable as select for template

> -----Original Message-----
> From: Michael Kay [mailto:mhkay@xxxxxxxxxxxx]
> Sent: Wednesday, September 19, 2001 7:27 PM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: RE:  variable as select for template
> 
> 
> > That was my try (it's a fragment):
> >
> > <xsl:variable name="parent_comp">  <!-- I wanted to get a 
> node set in
> > variable -->
> >   <xsl:choose>
> >    <xsl:when test="$comp_id=''">   <!-- the node set depends
> > on a condition
> > -->
> >      <xsl:value-of select="component[@class=$comp_class and
> > not(@id)]"/>
> >    </xsl:when>
> >    <xsl:otherwise>
> >      <xsl:value-of select="component[@class=$comp_class and
> > @id=$comp_id]"/>
> >    </xsl:otherwise>
> >   </xsl:choose>
> > </xsl:variable>
> >
> > then i could use variable $parent_comp just as node set here
> > and in other
> > places in stylesheet:
> > <xsl:apply-templates mode="extract_property" select="$parent_comp">
> >
> > If <xsl:value-of select"..."/> always get text() as result,
> > are there any solutions???
> >
> Yes, there's a neat trick for this one:
> 
> <xsl:variable name="parent_comp"
>   select="self::node()[$comp_id='']/
>             component[@class=$comp_class and not(@id)] |
>           self::node()[not($comp_id='')]/
>             component[@class=$comp_class and @id=$comp_id]"/>
> 
> It's basically forming the union of two node-sets, one of 
> which is always
> empty.
> 
> The aboev is a general approach. Looking at the specific 
> conditions used in
> this case, there is actually a simpler solution. If $comp_id 
> equals "", you
> want the components with no @id attribute; otherwise you want 
> those whose
> @id attribute equals $comp_id. I'm assuming $comp_id is a string.
> 
> You can select these nodes as
> select="component[@class=$comp_class and
>         (($comp_id='' and not(@id)) or ($comp_id!='' and 
> $comp_id=@id))]
> 
> Mike Kay
> 
Whau.... It's so simple.

It seems i have to learn yet a little ;)

Thanks Mike

Dmitri

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