[XeTeX] RTL Arabic footnotes + line numbers for critical edition

[Bernd Carl]

Hello,
I hope someone else has tried this before. I need to edit some Arabic 
manuscripts and for collation I need Arabic footnotes. I have looked 
into ledmac but it looks not really convincing to have the footnotes on 
the left side when all the text is on the right side. It is probably 
possible to use footnotes in ArabTex but line numbers are not possible 
in RTL contexts. In Xetex I couldn't get footnotes working inside Arabic 
texts (using \footnote {xyz}. So right now I'm a bit lost. Maybe someone 
has an idea?
This is what I tried: ArabTex and lineno and/or ledmac, Xetex.

Thank you, Bernd.