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XML query language

• From: keshlam@u...
• Date: Thu, 1 Apr 1999 11:33:33 -0500

>Sure. A node list is a list of nodes. No more, no less.

Actually, a DOM NodeList is something more: it is a dynamic filtered view of the
document, a list of nodes WHICH CHANGES AS THE DOCUMENT IS EDITED so that it
always represents the results as if the query had just been issued. If you
(re)move a node from the tree, the NodeList changes too... and the integer
indices no longer refer to the same nodes they did a moment ago.

This is, if you'll excuse my French, a bitch-kitty to implement; you need either
DOM Level 2 event handling or a lightweight version thereof. It's also, in my
experience so far, a serious risk of performance problems and/or logic errors
unless your document is static or nearly so.

Caveat usetor; know what you're getting into before you request one. And
consider whether the DOM Level 2 iterator frameworks will be a better answer.

______________________________________
Joe Kesselman  / IBM Research
Unless stated otherwise, all opinions are solely those of the author.



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