[XeTeX] Numerals in Right-to-Left

[Christopher Creutzig]

Hans Hagen wrote:

> actually this kind of features should be built in, kind of:
> 
> \xetexdigitbase=<number>
> 
> \def\arabicnumber  {\xetexdigitbase"0660\relax}
> \def\persiannumber {\xetexdigitbase"06F0\relax}

  Perhaps \font\arabfont="Geeza Pro:mapping=arabicnumers" and 
\font\persianfont="Geeza Pro:mapping=persiannumbers"?  (Can mappings be 
nested, to additionally include the tex-text mapping for --- etc.?)

regards,
	Christopher Creutzig