[XeTeX] polyglossia overline on a number of lines (another attempt)

[Gareth Hughes]

Vafa Khalighi wrote:
> Use umonline package:
> http://tug.ctan.org/cgi-bin/ctanPackageInformation.py?id=umoline

وفا!
I can't get umoline to play nicely in Syriac. Can you actually typeset
multiline Persian with \Overline?

Gareth.