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Re: Cheaper to prepend or append an item to a sequence

Subject: Re: Cheaper to prepend or append an item to a sequence?
From: Andrew Welch <andrew.j.welch@xxxxxxxxx>
Date: Tue, 22 Feb 2011 14:25:55 +0000
Re:  Cheaper to prepend or append an item to a sequence
>>             <report test="@id = (//@id[not(ancestor::meta)] except @id)">

> The most
> inefficient part of this is the test [not(ancestor::meta)] - it would be
> nice if Saxon were smart enough to remember while scanning the elements
> whether it has passed more meta start-tags than end-tags - but sadly, it
> isn't.

couldn't that be rewritten as:

@id = //@id except (@id, //meta//@id)

to avoid the ancestor walk?

--
Andrew Welch
http://andrewjwelch.com

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