RE: [xsl] <xsl:apply-imports> and rules with higher priority; And more!

["Michael Kay" <mike@xxxxxxxxxxxx>]

For most applications, I think <xsl:next-match> is more likely to do what
you want than <xsl:apply-imports>. It's certainly easier to understand.

xsl:next-match simply defines an ordering of all the template rules for a
mode, ordered first by precedence, then by priority, then by document order;
it finds the current template in that list, and calls the next one down the
list that matches the current node.

xsl:apply-imports is a bit more complicated; it only considers rules in an
"imported stylesheet layer", where a layer means a stylesheet that you
import, plus all modules that include or are included by that module.

The big advantage of next-match is that it allows you to invoke
lower-priority templates in the same module.

Michael Kay
http://www.saxonica.com/ 

> -----Original Message-----
> From: Johannes Neubauer [mailto:johannes.neubauer@xxxxxxxxxxxxxxxxx] 
> Sent: 04 June 2008 16:41
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] <xsl:apply-imports> and rules with higher 
> priority; And more!
> 
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> Hi,
> 
> The XSLT 2.0 Programmers Reference says, that 
> <xsl:apply-imports> calls the next template rule with lower 
> stylesheet level (is that the same like stylesheet layer?) 
> matching the same node as the current template.
> Furthermore it does NOT call template rules with lower 
> priority in imported stylesheets. What is about rules with 
> higher priority in an imported stylesheet with lower import 
> precedence?
> 
> In addition: Does <apply-imports> relate to (one of) all 
> stylesheets with lower import precedence or only to the ones 
> imported by the current ~ stylesheet (or stylesheet layer)? I 
> know this works:
> 
> A import C
> A include B
> => (import precedences: A = 2, B = 2, C = 1) B and A are on 
> the same layer, so <apply-imports> in A or B can involve C.
> 
> But does this work to?:
> 
> A import C
> A import B
> => (import precedences: A = 3, B = 2, C = 1) B has higher 
> import precedence than C. Does that mean <apply-imports> in B 
> can call a template rule in C?
> 
> Last but not least: I'd like to call <apply-imports> and if 
> there was another rule with higher priority, but a lower 
> import precedence I'd like to return the result of it, else 
> it should return the result of this template. But I don't 
> know how to access the information if there was another matching rule.
> 
> I like to change the rule that import precedence decides 
> which rule matches before rule priority like this:
> 
> Stylesheet B.xsl & C.xsl:
> <xsl:template match="test" priority="1 (: for B, 2 for C :)">
> 	<xsl:choose>
> 		<xsl:when test="there is another template rule 
> for apply-imports with higher priority">
> 			<xsl:apply-imports/>
> 		</xsl:when>
> 		<xsl:otherwise>
> 			<!-- sequence constructor for B or C 
> respectively -->
> 		</xsl:otherwise>
> 	</xsl:choose>
> </xsl:template>
> 
> Stylesheet A.xsl:
> <xsl:import href="C.xsl"/>
> <xsl:import href="B.xsl"/>
> 
> <xsl:template match="/" >
> 	<apply-templates/>
> </xsl:template>
> 
> wfg,
> Jonny.
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