From: William F Hammond <hammond@csc.albany.edu>

Date: Mon, 31 Mar 2008 11:10:33 -0400

To: public-html@w3.org, www-math@w3.org

Message-ID: <i7d4pboro6.fsf@hilbert.math.albany.edu>

Date: Mon, 31 Mar 2008 11:10:33 -0400

To: public-html@w3.org, www-math@w3.org

Message-ID: <i7d4pboro6.fsf@hilbert.math.albany.edu>

James Graham <jg307@cam.ac.uk> writes: >> With a small amount of text editor support such as closing open >> elements and less perhaps small amount of text editor support such as >> auto-completion of element names based on language knowledge, it doesn't >> really take many more key strokes to type >> \frac{\partial \mathbf{D}}{\partial t} >> as >> <mfrac> <mo>∂</mo><mi mathvariant="bold">D</mi></mfrac> Actually there's no denominator in this MathML. (The pace of this discussion has become a bit frenzied, hasn't it.) <mfrac> <mrow><mo>∂</mo><mi mathvariant="bold">D</mi></mrow> <mrow><mo>∂</mo><mi>t</mi></mrow> </mfrac> The original LaTeX is much closer to this author-level XML: <frac> <numr>∂<mathbf>D</mathbf></numr> <denm>∂t</denm> </frac> Less cpu is burned going from the LaTeX to the author-level XML than is burned going from the author-level XML to the MathML. Most of that is involved in accurately constructing, with a recursive descent, the tree of the mathematical expression -- something that has an abstract mathematical reality independent of the design of MathML (but not invariant from author to author). If math is included in html5, will html5-browsers be 'required' to support it? (Have any so committed?) Even if html5 browsers are going to provide such authoring services that really belong in the author's shop, I fear that html5-math will wind up with the reputation of being unacceptably slow. (And I fear that could be its downfall.) The following xhtml+mathml item has 1086 mathml nodes, out of 3250 elements in all, and is still a bit slow for a document of that size: http://math.albany.edu/math/demos/nyjm/9-8.xhtml I don't want to think about slowing down such an article significantly more with authoring services in the browser. Math aside, ordinary HTML is not a convenient format for direct authoring. So why all the attention to the idea of direct authoring of math? -- BillReceived on Monday, 31 March 2008 15:11:17 GMT

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