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Here are some rules that may work: - use unary concepts to name or describe static objects like mammals and elephants. - use relational concepts when talking about sets of related entities. - use constraint concepts when talking about dynamic relations.
On Jan 8, 2008, at 9:46 AM, Gian Piero Zarri wrote: "No W3C language provides a way to describe correctly and completely simple 'situations' (sorry, John), facts, events etc. that, like "Peter gave a book to Mary", are intrinsically n-ary". Secondly if, with your "meta-statements" sentences, you refer to proposals like that of making use of modal logics (sic!) to try to transform artificially into "n-ary" something that has been created as "binary", I don't agree at all. Make use of binary concepts to describe static notions (as "mammals" and "elephants" and the relationships among them) and use (in general) n-ary structures when you must describe dynamic situations, events, actions or whatever.
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