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

Date: Tue, 14 Jun 2005 17:58:39 +0100

Message-Id: <200506141658.RAA27539@penguin.nag.co.uk>

To: maths@mathsonly.com

CC: www-math@w3.org

Date: Tue, 14 Jun 2005 17:58:39 +0100

Message-Id: <200506141658.RAA27539@penguin.nag.co.uk>

To: maths@mathsonly.com

CC: www-math@w3.org

Thanks for your comments. In general the way to extend teh reah of content mathml is to use <csymbol definitionURL="some place with a definition in a language of your choice">something</csymbol> A symbol introduced like this may be used with <apply> for any kind of term construction, even if it isn't strictly function application. However in at least some of your cases, I think the existing diff and partial diff are sufficient. I would mark up your first one as follows: <math xmlns="http://www.w3.org/1998/Math/MathML"> <apply><eq/> <apply><diff/><ci>f</ci></apply> <apply><plus/> <apply><partialdiff/> <bvar><ci>x</ci></bvar> <ci>f</ci> </apply> <apply><partialdiff/> <bvar><ci>x</ci></bvar> <ci>f</ci> </apply> </apply> </apply> </math> Mozilla (using the stylesheets available at http://www.w3.org/Math/XSL renders that as f' = d^1/dx f + d^1/dy f (where the d's are partial diff operators) mathplayer (which can natively render content mathml) renders it as f' = d/dx f + d/dy f The superscript 1 in teh mozilla rendering is just a suboptimal choice in ctop.xsl which I should fix when I next update it: It ought to test for the case 1 and omit the explict superscript. However it's no wrong, I think, justa bit ugly. Both renders use a prime rather than a prefix D operator to render diff (if no explict bound variable is specified) again this is essentially a notaional choice, which could be varied y a simple change to the stylesheet, or by supplying a presentation mathml rendering to the diff operator by wrapping it in a semantics element. An essentially unrelated comment on your presentation mathml I don't think you should use InvisibleTimes between the d and x in dx. I tend to use no operator at all, but wrap them in an mrow to keep them together <mrow><mi>d</mi><mi>x</mi></mrow>. For the delta operator I'd se <csymbol with a definitionurl to some definition of the operator. > which by default renders in normal (not italic) text when converted to > <mi>δx</mi>. that is the wrong conversion (it would be upright as it's a two letter identifier in that form) You don't want a two letter identifier, you want two one letter ones (each of which will be italic by default) <mrow><mi>δ</mi><mo>⁡</mo><mi>x</mi></mrow> David ________________________________________________________________________ This e-mail has been scanned for all viruses by Star. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________Received on Tuesday, 14 June 2005 17:39:08 UTC

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