Re: [xsl] Sorting using helper structure, position(), xsl:ke

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Subject: Re: Sorting using helper structure, position(), xsl:key
From: Abel Braaksma <abel.online@xxxxxxxxx>
Date: Wed, 16 Apr 2008 17:31:56 +0200

Michael Ludwig wrote:


What I was referring to is the case of a large node-set, say, 300
nodes, which you have to repeatedly search, say, at each of 300
iterations. I've seen a significant speed-up using key('bla', @id)
versus $bla[@id = current()/@id], which is, I think, one of the reasons
why keys exist.

And also the reason I wrote "unfortunate" in the above quote.

I see what you mean. And yes, when comparing keys to using variables, then keys have the (big) advantage of (usually!, but don't try Altova, because then it may well slow down instead) faster execution time.

On a side note: some processors are known to do internal optimizations that are equal or even better then hand crafted key optimizations. I believe for XSLT 1.0 the .NET processor is one of those highly optimized ones, and for XSLT 2.0 I believe that Saxon starts to be increasingly more optimized with each new version.

Cheers,
-- Abel Braaksma

Current Thread
Re: Sorting using helper structure, position(), xsl:key, (continued) David Carlisle - 15 Apr 2008 16:14:41 -0000 Michael Ludwig - 15 Apr 2008 16:19:10 -0000 Abel Braaksma - 16 Apr 2008 07:41:14 -0000 Michael Ludwig - 16 Apr 2008 11:08:18 -0000 Abel Braaksma - 16 Apr 2008 15:32:33 -0000 <=

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