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Hi,
At 02:51 AM 9/24/2010, Mike wrote:
Also, the count(A)=count(A|B) method is a particular case of a more general set of methods for node set operations that aren't directly supported in XPath 1.0.
For example, $A[count(.|$B)=count($B)] is a way of performing node set intersection, where both $A and $B can be sets of more than one. And $A(count(.|$B)!=count($B)) is an 'except'.
Fortunately, all these are unnecessary in XPath 2.0
The generate-id(.) method may be a little easier to get your head around, at least once you've mastered what the generate-id() does. (But then you learn the other idiom too.)
Re: [xsl] Question about grouping
Subject: Re: [xsl] Question about grouping From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> Date: Fri, 24 Sep 2010 12:14:09 -0400 |
Hi,
At 02:51 AM 9/24/2010, Mike wrote:
Both methods
count(A) = count(A|B)
and
generate-id(A) = generate-id(B)
are perfectly acceptable and "standard" ways of comparing node identity in XSLT 1.0. Years ago Jeni did some measurements and found that in some processors the first was faster, in others the second was faster. Both are in common use.
Also, the count(A)=count(A|B) method is a particular case of a more general set of methods for node set operations that aren't directly supported in XPath 1.0.
For example, $A[count(.|$B)=count($B)] is a way of performing node set intersection, where both $A and $B can be sets of more than one. And $A(count(.|$B)!=count($B)) is an 'except'.
Fortunately, all these are unnecessary in XPath 2.0
The generate-id(.) method may be a little easier to get your head around, at least once you've mastered what the generate-id() does. (But then you learn the other idiom too.)
Cheers, Wendell
====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. http://www.mulberrytech.com 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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