RE: [xsl] Pick up generated numbering for cross reference using key?

Subject: RE: [xsl] Pick up generated numbering for cross reference using key?
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Tue, 22 Mar 2005 13:21:44 -0000
Keys apply to any document, including a temporary document created in a
variable. You don't need to indicate in the xsl:key declaration which
document they are intended to be used with, they automatically apply to the
document that contains the context node at the time you call the key()

What you are essentially suggesting here is doing a two-phase transformation
in which the section numbers are generated during the first phase, and the
cross-references are filled in during the second phase. That's a perfectly
reasonable design approach, but you haven't convinced me that it's
necessary. If the number of a table can be computed by examining where the
table is in the source document, then you can use the approach of
recalculating the number each time you process a cross-reference.

Michael Kay 

> -----Original Message-----
> From: Cas Tuyn [mailto:Cas.Tuyn@xxxxxxxx] 
> Sent: 22 March 2005 13:14
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] Pick up generated numbering for cross 
> reference using key?
> Hi,
> My tables have double-digit numbering generated from the 
> section number
> as a variable, and the calculated sequence inside the section:
> <xsl:template match="table">
> 	<xsl:param name="secnum" />
> 	<xsl:variable name="tabnum">
> 		<xsl:value-of select="count(preceding::table)+1" />
> 	</xsl:variable>
> ... lines left out ...
> 	<caption>
> 		Table <xsl:value-of select="$secnum" />.<xsl:value-of
> select="$tabnum" /> <xsl:value-of select="title" />
> 	</caption>
> </xsl:template>
> This works good. Now I'm trying to make cross references to those
> tables. I've searched the xsl archives and found a 2001 
> thread where it
> was suggested to either calculate it again (impossible because of the
> section-part being a variable), or store it in a key value. The latter
> method reminds me of arrays in other languages, so I thought 
> it was the
> right direction.
> Using the 'XSLT programmers reference' it appears that:
> 1. you can only use xsl:key immediately under the root of the 
> document,
> 2. put existing text or attribute values (not generated) in there.
> I was hoping to insert:
> 	<xsl:key name="table-number" match="@id" use="$secnum . $tabnum"
> />
> immediately below the variable definition shown above, but 
> that returned
> "Unexpected child" due to rule #1 not observed.
> The XML code for origin and target of the link:
> 	<xref role="table" linkend="csrh026a.dia-6"/>
> 	<table id="csrh026a.dia-6">
> The XSLT for the origin of the link:
> 	<xsl:template match="xref">
> 		<xsl:for-each select="@linkend">
> 			<xsl:variable name="linkend" select="."/>
> 			<xsl:element name="a">
> 				<xsl:attribute
> name="href">#<xsl:value-of select="."/></xsl:attribute>
> 				<xsl:for-each select="../@role">
> 					<xsl:choose>
> 						<xsl:when
> test="(.='table')">
> 							table x.x
> 						</xsl:when>
> 					</xsl:choose>
> 				</xsl:for-each>
> 			</xsl:element>
> 		</xsl:for-each>
> 	</xsl:template>
> The "x.x" should be the number of the table where I refer too.
> Questions:
>  1. Is this a good way of doing this?
>  2. Is there a better way using XSLT 1.0
> Regards,
> Cas
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