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Hi Corey, that's a good explanation, thank you very much. I was not aware of this. Now, I understand it. Cheers, Thomas Hi Thomas, In most Library applications, these tend to appear in pairs, with repeatable / non-repeatable establishing max cardinality and optional / mandatory establishing min cardinality. * Optional & Non-Repeatable = [0,1] * Optional & Repeatable = [0,*] * Mandatory & Non-Repeatable = [1,1] * Mandatory & Repatable = [1,*] Does that help? Best, -Corey On Tue, Dec 16, 2014 at 11:13 AM, Bosch, Thomas <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hi, just a short question coming into my mind right after the meeting. Can you clarify the difference between repeatable (>1), non-repeatable (<=1) and mandatory (1) and optional (0,1) properties? Am I right with the semantics? And specifically, why do we need non-repeatable when we have both mandatory and optional? Thanks, Thomas -- Corey A Harper Metadata Services Librarian New York University Libraries 20 Cooper Square, 3rd Floor New York, NY 10003-7112 212.998.2479 [log in to unmask]<mailto:[log in to unmask]>