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Re: XPath for matching multiple child elements
Subject: Re: XPath for matching multiple child elements|
From: "Will McCutchen" <mccutchen@xxxxxxxxx>
Date: Thu, 28 Sep 2006 22:49:54 -0500
On 9/28/06, Michael Kay <mike@xxxxxxxxxxxx> wrote:
Yes, but it might have fairly horrible performance.
I don't know how other processors work, but with Saxon, patterns are a lot
more efficient if they identify the element names that match, because Saxon
basically does a hash lookup on the node kind and then on the node name. Any
match="*" pattern gets tested against every node; and in this case that will
involve a serial search through the list of h1|p|b|i elements, which is
distinctly O(n^2). Not worth the savings in keystrokes.
Yeah, I started to use Wendell's suggestion, but I decided for myself
that having the template matching pattern spelled out explicitly
(<xsl:template match="comments//h1 | comments//p ...">) would be
better for my (and others') long-term comprehension of the style
sheet. I'm glad to see that I probably made a good choice
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