Re: Keys off of variable xml source

Hmmm... thanks Wendell, now just thinking if this approach will work for me.
If I'm driving off of the xml source document, and need to perform a
lookup of my key which references external xml source, then I guess
I'm not in context....



On Thu, 31 Mar 2005 18:27:53 -0500, Wendell Piez
<wapiez@xxxxxxxxxxxxxxxx> wrote:
> Karl,
> 
> At 06:17 PM 3/31/2005, you wrote:
> >Is it legal to create a key off of an xml source stored as a variable?
> >So the key decleration might look like:
> >
> ><xsl:key name="myKey" match="$external_xml_source//data" use="some_element"/>
> 
> This isn't legal, but not for the reason you think. In XSLT 1.0, a match
> pattern can't contain a variable reference.
> 
> >If not, is there a workaround?
> 
> None is needed, really. If you declare the key normally
> 
> <xsl:key name="myKey" match="data" use="some_element"/>
> 
> and then be sure that when you call it, the context is inside
> $external_xml_source, you'll be fine:
> 
> <xsl:variable name="var" select="[anything you need to capture context]"/>
> <xsl:for-each select="$external_xml_source">
>   ... inside here the key will retrieve nodes from $external_xml_source,
>       and $var still refers to whatever you need from outside it ...
> </xsl:for-each>
> 
> Your XSLT processor has enough information here to do the right thing --
> and keys are specified to work this way.
> 
> This is a FAQ.
> 
> Cheers,
> Wendell
> 
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