[orca-list] xPath

["Rich Caloggero" <rjc MIT EDU>]

xPath will work with both XML and HTML documents:
http://www-xray.ast.cam.ac.uk/~jgraham/mozilla/xpath-tutorial.html

----- Original Message ----- 
From: "Rich Caloggero" <rjc MIT EDU>
To: "Jason White" <jason jasonjgw net>
Cc: <orca-list gnome org>
Sent: Thursday, July 10, 2008 2:58 PM
Subject: Re: [orca-list] Still issues with the navigation extension in FF


Hi Jason.

My understanding is that xPath only works on XML documents. What happens if
we load an HTML4 document? Will xPath still be usable?

Thanx.
-- Rich


----- Original Message ----- 
From: "Jason White" <jason jasonjgw net>
To: <orca-list gnome org>
Sent: Wednesday, July 09, 2008 12:51 AM
Subject: Re: [orca-list] Still issues with the navigation extension in FF


On Tue, Jul 08, 2008 at 02:22:48PM -0400, Rich Caloggero wrote:

> This is due to the way I'm processing the document. Because I wanted a
> quick
> and durty first pass, I process the entire document and extract all links
> (or headings depending on which extension we're talking about) into an
> array
> each time I open the extension's main dialog. This gives a large
> performance
> hit for large pages. I'll fix this soon.

As others have suggested, XPath might give you more efficient results. While
it would be possible to maintain a cache of the links (or headings), the
problem is that a client-side script can modify the DOM at any moment,
potentially modifying/inserting/deleting links or headings. The added
complexity of obtaining and handling mutation events to detect such changes,
and keeping the cache accurate, may not be worth the efficiency gain.

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