[XeTeX] Issue with Arabic Typography

[Jonathan Kew]

On 28 Feb 2009, at 13:30, Gareth Hughes wrote:

> وفا خلیقی wrote:
>> Thanks Fr. Michael for your answer.
>>
>> But Gareth, why do you want it to be a package. use \input to load  
>> it.
>>
>> -- VK
>
> Maybe I'm missing something here, but I have tried \input and
> \usepackage and both methods halt xelatex and produce errors. The  
> error is
>
>> ! Undefined control sequence.
>> \dosetclass ...nishsetclass \else \XeTeXcharclass
>>                                                  "\test = \theclass  
>> \let \n...
>> l.25 \setclass \A {0622,0623,0625,0627}
>
> I can't see why this is not working. Any thoughts?

Looks like you're running an old version of XeTeX, that predates the  
inter-character token mechanism this is using. This requires at least  
XeTeX 0.997.

JK