From: David Carlisle <davidc@nag.co.uk>

Date: Tue, 16 Apr 2002 08:38:25 +0100

Message-Id: <200204160738.IAA26854@penguin.nag.co.uk>

To: jimbofc@yahoo.com

CC: www-math@w3.org

Date: Tue, 16 Apr 2002 08:38:25 +0100

Message-Id: <200204160738.IAA26854@penguin.nag.co.uk>

To: jimbofc@yahoo.com

CC: www-math@w3.org

> the layout is part of the content, so the > presentation language should allow multiple layouts of the same code. No, that is what the content markup is for. Content markup has a default presenatation form but my be presented in any visual or non visual format chosen by the rendering agent. But you need some method of specifying mathematical layouts, that's what the presentation elements are for. If you want to unambiguously express the idea of a fraction use <apply><divide/> <mfrac>expresses the notion of a mathematical layout scheme involving two terms laid out vertically with a line between. If you know the context you can of course infer meaning from this mathematical layout but it is always context dependent. > (Here's a good (I hope) example. Visual rendering agents might style an > mfrac element as two rows separated by a bar. However, a blind person's > audio rendering agent might style the mfrac element by saying the > (insert natural language here) translation of the numerator + "over" + > the denominator. The blind person would be confused if it was rendered > as the numerator + "1 pixel solid bar" + denominator.) That's one reason for having specific mathematical layout rather than just re-using generic css styling, mfac can be rendered as "over" in an aural rendering wheras general css lines are probably ignored altogether as css styling is purely decorative. But whether it's rendered as two terms with a line or two spoken phrases and teh word over, it is still essentially the layout that is being specified, not the mathematical concept of division. David _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service.Received on Tuesday, 16 April 2002 03:39:19 UTC

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