Acch. Sorry for the noise. It should be

\definefallbackfamily[mainface][serif][Scheherazade][range=0600-077F,
features=arabic]

Alan

On Fri, Feb 5, 2016 at 6:28 AM, Alan Bowen <bowenalan03@gmail.com> wrote:

>  currently have:
>
> \definefontfeature
>  [arabic]
>  [mode=node,language=dflt,script=arab,
>   init=yes,medi=yes,fina=yes,isol=yes,
>   liga=yes,dlig=yes,rlig=yes,tlig=yes,
>   calt=yes,trep=yes,mark=yes,mkmk=yes,
>   kern=yes,curs=yes]
>
>
> \definefallbackfamily[mainface][serif][Scheherazade][range=0600-077F][features=arabic]
>
> and get output in which the letters are not joined up into words but
> printed separately, as in
>
> ثم يتعرف وزن ما يحتاج اليه مع وزن الكفة لموازاة الافق بالعمود
> Is there a setting that I have missed?
>
> Alan
>