Jonathan Kew wrote:
> What happens at the boundary in "AB"? Should it depend on the numerical > values of the classes, or the order in which the transitions were > specified, or what? "Clearly" it should not depend on the numerical values of the classes, since in reality the precedence may have only a partial ordering : (1 > 2 > 3 > 1) but the use of a comma does not suggest ordering. Therefore I would suggest a variant syntax : \XeTeXintercharclasses `A = {1; 2} \XeTeXintercharclasses `B = {3; 4} where the semi-colon is an Algol-68 GOON (= "go on") delimiter indication serial elaboration rather than collateral. Given the modified syntax proposed above, what happens at the boundary in "AB" would appear to me to be as follows : [1] \XeTeXintercharclasses `A = {1; 2} [1] \XeTeXintercharclasses `B = {3; 4} [2] \XeTeXinterchartoks 1 3 = {foo} [2] \XeTeXinterchartoks 1 4 = {bar} [2] \XeTeXinterchartoks 2 3 = {xyzzy} [2] \XeTeXinterchartoks 2 4 = {plugh} Ruleset [1] states that 1-transitions are to be considered before 2-transitions when an "A" is encountered; similarly, the same ruleset states that 3-transitions are to be considered before 4-transitions when an "B" is encountered. Thus when we hit an "AB" sequence, the interchartoks will be inserted in the order {foo}{bar}{xyzzy}{plugh}. N'est-ce pas ? Philip Taylor -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex