text descriptions in OWL-S service profiles

Dear readers,
I have just noticed that OWL-S v1.1 does *not* give
a range for property textDescription of class Profile
while earlier versions (e.g., v1.1Beta) gave http://www.w3.org/2001/XMLSchema#string
as the range.

Is there a reason for this change? This change does not seem to be documented in 
http://www.daml.org/services/owl-s/1.1/Profile.owl.

Thanks,
Manolis Koubarakis