From: Mike Dean (mdean@bbn.com)
Date: 12/07/04
To ground our discussions about n-ary relations, I propose that we use several examples based on the W3C SWBPD note on n-ary relations [1]. The specific examples are If a subject has a diagnosis with HIGH probability, the subject has the disease. Given a Purchase, the buyer owns the object. A SWRL encoding of these rules (executable using SweetRules following a few corrections to the published diagnosis.owl) is attached. It might also be desirable to have an example where the conclusion involves an n-ary relation. A possible n-ary encoding for the has_diagnosis relation would be to use 1 fixed argument (subject) and 2 slotted arguments and for the Purchase relation to use 5 slotted arguments. Note that the has_diagnosis relation is primarily centered around a property, while the Purchase relation is centered around a class - other encodings are also possible. Note also that both relations are intended to allow unspecified values (the slots are functional). Can we come up with an n-ary representation that's significant simpler or otherwise better than the unary/binary SWRL representation? Mike [1] http://www.w3.org/TR/swbp-n-aryRelations/
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