Hi Khaled, I extended the font mechanism to deal with bidirectional math fonts in such a way that we can have a mixed document (probably mostly usefull for testing fonts). I've put a beta on the ftp server. Hopefully I didn't mess up regular math too much. % example from the xits suite % \setupbodyfont[xits] \setupbodyfont[xitsbidi] \setupalign[r2l] \starttext \setupmathematics[align=r2l] \startformula \sqrt{ف^2\over 4ب} \eqno(1) \stopformula \setupmathematics[align=l2r] \startformula \sqrt{x^2\over 4x} \eqno(1) \stopformula \stoptext The magic is in defining the font i.e. a typescript needs to define it. In font-otf I patched the definition: \starttypescript [math] [xits,xitsbidi] [name] \definefontsynonym[MathRoman] [\s!file:xits-math.otf][\s!features=\s!math\mathsizesuffix,\s!goodies=xits-math] \definefontsynonym[MathRomanL2R][\s!file:xits-math.otf][\s!features=\s!math\mathsizesuffix-l2r,\s!goodies=xits-math] \definefontsynonym[MathRomanR2L][\s!file:xits-math.otf][\s!features=\s!math\mathsizesuffix-r2l,\s!goodies=xits-math] \stoptypescript There are some extra predefined featuresets. The R2L and L2R names are just symbolic and used here: \definebodyfont [default] [mm] [mr=MathRoman mo 1, mrlr=MathRomanL2R mo 1, mrrl=MathRomanR2L mo 1] Now, bidi is explicitly enabled by setting the direction parameter: \starttypescript[xitsbidi] \definetypeface [xitsbidi] [rm] [\s!serif] [xits] [\s!default] \definetypeface [xitsbidi] [ss] [\s!sans] [heros] [\s!default] [\s!rscale=0.9] \definetypeface [xitsbidi] [tt] [\s!mono] [modern] [\s!default] [\s!rscale=1.05] %definetypeface [xitsbidi] [mm] [\s!math] [xitsbidi] [bidi] [\s!direction=\s!both] \definetypeface [xitsbidi] [mm] [\s!math] [xitsbidi] [\s!default] [\s!direction=\s!both] \stoptypescript Maybe at some point we can just default to bidi for xits. Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------