Re: [xsl] Question about keys and cross-referencing (was predicate)

[Chris Loschen <loschen@xxxxxxxxxxxxx>]

At 04:28 PM 5/5/03, you wrote:
> Chris,
>
> At 03:33 PM 5/5/2003, you wrote:
> > So I've got an input structure like this:
> >
> > <e eid="e0001"><hg><hw>keyword</hw></hg><se1>...</se1></e>
> > ...
> > <e eid="e1234"><hg><hw>different_keyword</hw></hg><se1>... <xg>See also 
> > <xr>keyword</xr></xg>...</se1></e>
> >
> > where the <xr> element "keyword" needs to link to the <e> element where 
> > the <hw> is "keyword".
> >
> > I'm thinking that I can set up a key like
> >
> > <xsl:key name="headwords" match="hw" use="ancestor::e/@eid" />
> >
> > and then reference it in my xr template like
> >
> > <xsl:attribute name="href"><xsl:text>#</xsl:text><xsl:apply-templates 
> > select="key('headwords',ancestor::e/@eid)" /></xsl:attribute>
> >
> > Does that sound right?
>
> I'd say -- not quite. "ancestor::e/@eid" for the current node when the 
> template is matched, where this attribute is generated, will be e1234, not 
> e0001. You want to refer to e0001.
>
> You could define your key as
>
> <xsl:key name="e-by-hw" match="e" use="hg/hw"/>
>
> Then
>
> <xsl:apply-templates select="key('e-by-hw',.)"/> to select the target "e" 
> element refered to by its headword elsewhere.
>
> > Sometimes I've got several headwords that are identical except for the 
> > homograph numbers, like so:
> >
> > <e eid="e0003"><hg><hw>keyword</hw><hom>1</hom></hg><se1>...</se1></e>
> > <e eid="e0004"><hg><hw>keyword</hw><hom>2</hom></hg><se1>...</se1></e>
> > <e eid="e0005"><hg><hw>keyword</hw><hom>3</hom></hg><se1>...</se1></e>
> >
> > and these are referenced like so:
> >
> > <e eid="e2345"><hg><hw>different_keyword</hw></hg>... <xg>See also 
> > <xr>keyword</xr><hom>1</hom></xg>...</e>
> >
> > Is there a way to include those homograph numbers in the key and in the 
> > cross-reference so that I get the
> > correct (I hope unique) link?
>
> Sure, you could define your key as
>
> <xsl:key name="e-by-hw" match="e" use="concat(hg/hw, '-' ,hg/hom)"/>
>
> Then
>
> <xsl:apply-templates select="key('e-by-hw',concat(., '-' ,../hom))"/>
>
> Make sense?

Very cool! I'll play around with it and see what I can come up with. Thank 
you very much!


--Chris

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