XML query language

keshlam at us.ibm.com keshlam at us.ibm.com
Thu Apr 1 18:35:40 BST 1999

>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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