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
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Wendell Piez
mailto:wapiez(_at_)mulberrytech(_dot_)com
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
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