From: Alexander J. Vincent <jscript@pacbell.net>

Date: Sun, 16 Jun 2002 14:25:24 -0700

To: www-math@w3.org

Message-id: <3D0D0244.5060104@pacbell.net>

Date: Sun, 16 Jun 2002 14:25:24 -0700

To: www-math@w3.org

Message-id: <3D0D0244.5060104@pacbell.net>

Dear Sirs, I've been wondering what the best procedure is, if there are any, for using SVG or a custom XML language within a MathML fragment to define or reference objects defined in the alternate language. For instance, the SVG 2 Requirements document suggests "SVG may define points and allow shape elements and paths to reference them. This would facilitate connection points on elements. [SVG 2.0]". (Section 4.2.1.5) I personally would love to reference a point in SVG and use it in a mathematical equation in MathML. Even if SVG did not implement a feature like this, I may end up creating an XML language module (compatible with the Modularization of XHTML Recommendation) to define certain basic features to analytic geometry. It's not entirely clear from the MathML specification what MathML markup I would use to create such a connection. Suppose I had a line in SVG: <line x1="0" y1="0" x2="1" y2="1" id="AB" /> The slope of this line is equal to 1. (y2 - y1) / (x2 - x1). In MathML, I could say, <?xml version="1.0" encoding="iso-8859-1"?><!DOCTYPE math PUBLIC "-//W3C//DTD MathML 2.0//EN" "http://www.w3.org/TR/MathML2/dtd/mathml2.dtd"> <!-- Created by amaya 6.1, see http://www.w3.org/Amaya/ --> <math xmlns="http://www.w3.org/1998/Math/MathML"> <mfrac> <mrow> <mrow> <mo>(</mo> <msub> <mi>y</mi> <mn>2</mn> </msub> </mrow> <mi></mi> <mo>-</mo> <mi></mi> <msub> <mi>y</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> <mrow> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>2</mn> </msub> </mrow> <mi></mi> <mo>-</mo> <mi></mi> <msub> <mi>x</mi> <mn>1</mn> </msub> <mo>)</mo> </mrow> </mfrac> <mi></mi> <mo>=</mo> <mi></mi> <mn>1</mn> </math> But I lose any reference I had to the SVG line element. I'm wondering how I would build (a) a semantic reference to that line element, and (b) a definition of a slope function referencing that element, both within the context of content MathML and possibly presentation MathML as well. I have a couple ideas on defining the slope function, based on my reading of the Content MathML chapter, but I am totally lost on how to build a reference to an element outside the MathML language. Ideally, I'd love to do something like this: <apply> <eq /> <apply> <slope /><!-- attributes as necessary --> <svg:use xlink:href="#AB" /> </apply> <cn>1</cn> </apply> Any suggestions on how I might go about doing this?Received on Sunday, 16 June 2002 17:25:28 UTC

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