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

Subject: Re: [xsl] Question about keys and cross-referencing (was predicate)
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Mon, 05 May 2003 16:28:00 -0400

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"/>


<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)"/>


<xsl:apply-templates select="key('e-by-hw',concat(., '-' ,../hom))"/>

Make sense?


====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. 17 West Jefferson Street Direct Phone: 301/315-9635 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ======================================================================

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