Preferred terms

ISSUE-179 raises a question about our definition of preferred and  
alternate terms (labels), in particular whether multiple preferred  
terms are allowed. I was under the impression that the convention in  
thesauri was that concepts had at most one preferred term, leading to  
the constraint. The notion of "preferred", to me at least suggests a  
singleton. I note, however, that this is not explicitly stated in our  
user requirements. Can anyone provide links to concrete rationale or  
existing standards where this is discussed?

Thanks,

	Sean

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Sean Bechhofer
School of Computer Science
University of Manchester
sean.bechhofer@manchester.ac.uk
http://www.cs.manchester.ac.uk/people/bechhofer