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Symmetric Property (* Concept *)

http://purl.org/linguistics/gold/SymmetricProperty

**Definition:**
Properties may be stated to be symmetric. If a property is symmetric, then if the pair (x,y) is an instance of the symmetric property P, then the pair (y,x) is also an instance of P. For example, friend may be stated to be a symmetric property. Then a reasoner that is given that Frank is a friend of Deborah can deduce that Deborah is a friend of Frank. [McGuinness & van Harmelen 2004]

Usage Notes