[XeTeX] Preventing a line break at a given set of characters

[Shiva Shankar]

Hi,

Is it possible to prevent the linebreak at a given set of characters?
for example TeX will never break a line at fullstop(.) I mean
fullstop alone never goto next line (unless there is a space behind
it). Similarly for comma(,), semicolon(;) etc.

-- 
Regards
Shivashankar
Sriranga Digital Software Technologies Pvt. Ltd.,
Srirangapatna