In extensions-001.tex
(http://minimals.metatex.org/current/context/test/doc/context/tests/mkiv/fonts/extensions-001.tex)
 
there is an example how to add or change the kern between two chars:


    fonts.handlers.otf.addfeature {
        name = "ktest",
        type = "kern",
        data = {
            a = { b = -500 },
        }
    }


Can this be used to implement also a "Single adjustment positioning" 
which would effectivly change the width of character? 

(http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html#6.a)

(I tried a few probable variants but got either errors or no effect
at all).



-- 
Ulrike Fischer 
http://www.troubleshooting-tex.de/

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