From: Bernhard Keil <Bernhard.Keil@soft4science.com>

Date: Fri, 30 Jan 2004 11:52:29 +0100

To: <www-math@w3.org>

Cc: <Vincent.Quint@inrialpes.fr>

Message-Id: <20040130105048.4BDC5880280@egp.w3.org>

Date: Fri, 30 Jan 2004 11:52:29 +0100

To: <www-math@w3.org>

Cc: <Vincent.Quint@inrialpes.fr>

Message-Id: <20040130105048.4BDC5880280@egp.w3.org>

In my oppinion there may not be a difference whether you have: <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mrow> .. some stuff </mrow> </math> or: <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> .. some stuff </math> furthermore <math> should behave in the same way as <mrow>. So I would say Amaya is right in this case. Bernhard Keil mailto:Bernhard.Keil@soft4science.com http://www.soft4science.com -----Original Message----- From: www-math-request@w3.org [mailto:www-math-request@w3.org] On Behalf Of Vincent Quint Sent: Friday, January 30, 2004 11:37 AM To: www-math@w3.org Cc: Vincent.Quint@inrialpes.fr Subject: When to stretch parentheses An user of Amaya reported recently an interesting case where Amaya and Mozilla do not render an expression the same way. I checked the spec and I am not sure how to interpret it to decide who is right. Here is the case: <math xmlns="http://www.w3.org/1998/Math/MathML" display="block"> <mi>e</mi> <mo>(</mo> <mi>CM</mi> <mo>)</mo> <mo>=</mo> <mfrac> <mi>a</mi> <mi>b</mi> </mfrac> </math> In Amaya, the parentheses have the same height as the fraction, while in Mozilla they are much smaller and have the same height as the characters "CM" they enclose. So, I checked the MathML 2.0 spec (2nd edition). Section 3.2.5.8.2 of the MathML 2.0 spec (2nd edition) "Vertical Stretching Rules", first bullet, says: "If a stretchy operator is a direct sub-expression of an mrow element, ....then it should stretch to cover the height and depth (above and below the axis) of the non-stretchy direct sub-expressions in the mrow element..." I guess this is in favor of Mozilla: the stretchy operators are not children of an mrow element, but children of a math element. But, reading the spec further, section 7.1.2 "The Top-Level math Element", 3rd paragraph says: "The math element can contain an arbitrary number of children schemata. The children schemata render by default as if they were contained in an mrow element." (here, I suppose that "schemata" means "elements", and that "children" means the same as "direct sub-expression" in section 3.2.5.8.2). This seems to be in favor of Amaya. Is my reasoning right? Or should Amaya do the same as Mozilla? I should add that if you introduce an mrow element as a child (or direct sub-expression) of the math element, to enclose all the contents of the original math element, both Amaya and Mozilla do the same: they display large parentheses. Thanks for any advice, Vincent. ------------------------------------------------------- Vincent Quint INRIA Rhône-Alpes INRIA ZIRST e-mail: Vincent.Quint@inria.fr 655 avenue de l'Europe Tel.: +33 4 76 61 53 62 Montbonnot Fax: +33 4 76 61 52 07 38334 Saint Ismier Cedex FranceReceived on Friday, 30 January 2004 05:51:13 GMT

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