May I bump?
The following code used to work, but now it gives an error:
\usemodule[simplefonts]\definefontfeature[hebrew][default][mode=node,script=hebr,language=dflt,mark=yes,ccmp=yes]
\setmainfont[Ezra SIL SR][features=hebrew]
\setupdirections[bidi=on]
\starttext
בְרֵאשִ֖ית בָרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָמַ֖יִם וְאֵ֥ת הָאָֽרֶץ\stoptext
The following variant (without "script=hebr") compiles but the vowels are misplaced (not centered below the letters), which "ccmp=yes" (see http://www.microsoft.com/typography/otspec/features_ae.htm#ccmp) is supposed to request:
\usemodule[simplefonts]
\definefontfeature[hebrew][default][mode=node,language=dflt,mark=yes,ccmp=yes]
\setmainfont[Ezra SIL SR][features=hebrew]
\setupdirections[bidi=on]
\starttext
בְרֵאשִ֖ית בָרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָמַ֖יִם וְאֵ֥ת הָאָֽרֶץ\stoptext
The problem in definefontfeature seems to be that the feature "ccmp=yes" is not taking effect, and the feature "script=hebr" generates an error.
Thank you very much for your advice.
Michael
\definefontfeature[hebrew][default][script=hebr,ccmp=yes]