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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Re: Math Arrows and Harpoons****From**:*Taco Hoekwater <taco.hoekwater@wkap.nl>***Date**: Fri, 13 Nov 1998 17:13:16 +0100 (W. Europe Standard Time)- Content-Length: 2756

Hello there, I have deleted the CC's to Hans and Barbara, since I gathered that you both are on the math-font-discuss (and it's a bit confusing that I get every message twice, I guess this holds for other people too). Now then, I agree with Hans in the discussion of Unicode policy rules (as I think we all do), but I still have to keep raising these questions. One important reason why we want full characters is MathML: It's convenient to have as many pre-built characters as possible in Unicode. This simplifies designing rendering engines for MathML and consequently the chances of those engines appearing will increase. I am forced (this is what being hired is all about :-) to include at least all characters that are in present Unicode + those that are in the STIX submission. Other than that, in all truth I don't care at all whether chars are or are not part of Unicode or AFII or whatever standard and whether or not the basic premisses of these standards are valid. The following logic follows: if Barbara says her arrows need to have angled heads, they will have angled heads. If Hans says he needs flat heads, I will add glyphs with flat heads. In general, at this moment I need to know: 1) if the renderings for the Unicode/STIX tables are correct. This is of major importance for the validity of the resulting fontset. 2) which of the missing symmetry cases will be adopted into STIX submission (since these will also need a glyph slot and I'd rather have them filled beforehand). This is important because it will save me a lot of work in the future. 3) for the two groups above: what the canonical names of the glyphs are supposed to be. This is important because these names will ultimately appear in the font file (at least for the Type 1 version) 4) what other full characters are needed (this list probably includes most of the symmetry cases that will not make it into the STIX submission, but there may be others as well, like the \leadsto style arrows). This is a bonus. I am trying to do a decent job for as much software as possible. If e.g. Mathematica needs a wide vector accent, then I will add one. There is, however, a limit to the amount of full symmetry cases that can be included. As I said before: I don't want to spend the next five years on this subject. And I doubt anyone would be happy with three different fonts that all contain arrows. Also, there is little point in adding glyphs that will never ever be used. I think the absolute upper limit on pre-built arrows is 222 (not counting harpoons). I will probably add a full arrow construction kit later, but it is more important now to have all needed full characters and their names decided upon. Greetings, Taco

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