OWL (or RDFS) and RDF and language tags

Hi everyone,

It's been suggested to me that this would be a good place to ask the 
following question. All suggestions or pointers are very much appreciated!

Is there either a standard way or a conventional way (best practice) for 
indicating that the range of a predicate is a localizable literal (i.e. 
plain literal with a language tag)? Similarly, is there a way to 
indicate in RDF Schema or OWL that the range of a property should be a 
plain literal w/ no language tag. (I guess that a datatype property of 
with range xsd:string is semantically equivalent to a plain literal with 
no language tag, but that still doesn't address my first question).

I read http://www.inter-locale.com/whitepaper/iswc2004.pdf but couldn't 
really make heads or tails as to whether it helps with my problem :) 
(I've since also been pointed to 
http://www.w3.org/2007/OWL/tracker/issues/71 which seems related to my 
question, but I can't tell whether resolution of the issue would solve 
my problem or not.)

thanks,
Lee