Re: Extended Iterators (was Re: Performance hit upgrading Xalan)

[James Melton <jm...@home.com>]

Scott,

I am making essentially no progress on this. I think I lack a fundamental
understanding of what you have in mind. You have proposed (option 3 below
and earlier) using match patterns to filter the nodes as we walk the tree.
Is there any example in Xalan of code that does this? Or lacking that, are
there two examples, one walking the tree and one matching nodes using match
patterns, that I can "Frankenstein" together into what you are describing?

Jim.

-----Original Message-----
From: Scott_Boag@lotus.com <Sc...@lotus.com>
To: James Melton <jm...@home.com>
Cc: xalan-dev@xml.apache.org <xa...@xml.apache.org>
Date: Monday, April 23, 2001 4:48 PM
Subject: Re: Extended Iterators (was Re: Performance hit upgrading Xalan)


>
>We need to either 1) with complex patterns go back to the
>select and sort method (this can have it's own cost, since <xsl:value-of
>select="//foo/@baz"/> only needs to find the first node in document order,
>or 2) find a better way to do depth-first in-order discovery (I believe
>James Clark in XT does something similar to what we do...), or 3) for some
>// patterns, simply walk the tree down and "filter" each node by treating
>the expression as a match pattern.
>