Subject: Re: fences (variable size math symbols) From: David Carlisle <davidc@xxxxxxxxx> Date: Mon, 8 Jun 1998 18:20:24 +0100 
> Meaning you can have as many > nested levels as you need. I'll think about this again but I currently don't see how nesting provides the right information. If I have an mrow element that contains three characters that all have the stretch attribute set to true, I need to stretch them all by the same amount. This is not the same as arbitrarily taking the subexpression containing the first two, making a fence object out of that, and then nesting that object in a fence object that wraps up the rest of the expression. In particular this latter algorithm would make the last fence larger if (as is often the case) the fences are being made slightly larger than the surrounding text. However it would probably do as a first attempt. Assuming that the effect on line breaking (if any) of nesting fence objects is not too detrimental. > You the user shouldn't need to do any "typesetting"; you > need only direct the flow of content into ports/areas, as it were. Yes I have to tell myself that every thirty seconds or so when using dsssl:) Coming from an expressive typesetting language like latex, using a style language which has no access to the typeset object is rather a shock. Like working with both hands tied behind your back! > That half of MathML explicitly encodes such formatting intentions may be > disregarded from the perspective of the DSSSL sheet. Now this I don't understand at all. If I want to write a dsssl spec so that any system that supports the dsssl math objects can typeset mathml then surely this is _exactly_ the half of mathml that I need to worry about. The content part of mathml I was planning to support by transforming to the presentation part of mathml. (This mapping is more or less fixed in the mathml recomendation.) > Your larger question was whether dsssl math flow objects are > sufficient to support MathML. I think the answer is probably yes, but > the mapping is indirect. Of course until somebody actually implements > such support this is purely speculative. Which strange enough is what I am trying to do at present:) David DSSSList info and archive: http://www.mulberrytech.com/dsssl/dssslist
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