Re: [xsl] configuring a conditional

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

Hi Bruce,

At 09:54 PM 5/23/2005, you wrote:
> > It's easy enough (although possibly expensive) to know if you are the
> > first citation to a particular reference, eg you could use xsl:number
> > and see if you get the number 1, or perhaps better havs an xsl:key that
> > matches all references, keyed on the reference id then you just have to
> > ask if the current node is the first node in document order in the
> > sequence returned by the key for this reference.
> > so for example if the syntax is
> >
> > <xref linkend="foo"/>
> >
> > and you want to know if this is the first such reference
> >
> > <xsl:key name="xr" match="xref use="@linkend"/>
> > ..
> > <xsl:template match="xref">
> >
> > <xsl:if test=". is key('xr',@linkend)[1]">
> >  I'm first
>
> OK, I tried to implement this in my rather complicated code, but am stuck.
>
>     <xsl:param name="cite-ref" as="element()*"/>
>     <xsl:message>
>       <xsl:if test="$cite-ref is key('refs',@linkend)[1]">FIRST</xsl:if>
>     </xsl:message>
>
> The message is result is always blank.

The question I'd ask is what's @linkend. This of course depends on what the 
context node is -- so we need to consider where this appears.

XSLT 2.0 functions work different from templates in that they don't have a 
context node (or position or size) ... instead of relying on being able to 
traverse from the context node to its @linkend attribute, for example, you 
have to pass the node in and then traverse to $node/@linkend.

Could this be an issue here? We need to see more code. But guessing out of 
the blue (that is, guessing you are defining a function here) I suppose you 
might try test="$cite-ref is key('refs',$cite-ref/@linkend)[1]".

Cheers,
Wendell


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
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