From: <vo...@fz...> - 2006-06-20 12:40:14
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> Why? Assuming _:1 is just an implicit node in SMW (with no funny existent= ial > meaning), I don't see anything wrong with this at all. > If we had N-ary relations: > At the instanceu level we have a 4-way hyper-link between Joe, Frank,=20 > "friend", and "1992". > Reduced to binary relations we add _:1 > there is a 2-way link between Joe and _:1 > and 3 other 2-way links between _:1 and Frank, "friend", and "1992". >> Whats an intuitive way of modeling "Joe knows Frank, they are friends >> since 1992" in OWL? > The same, since we must represent N-ary with binary. It is the same as > pattern-1 in > http://www.w3.org/TR/2004/WD-swbp-n-aryRelations-20040721/ >> Whats an intuitive way of modeling "Joe knows Frank, they are friends >> since 1992" in OWL? Well, using n-ary relations is not the only way. Reification would be another. Also, knowledge modeling is difficult: "Joe knows Frank, they are friends since 1992" - did they knew each other before 1992? - is "being friend" an attribute of their "knowing" relation or is it an additional relation? Depending on your answers I would model it differently in RDFS. Kind regards, Max V=F6lkel -- Dipl.-Inform. Max V=F6lkel, Universit=E4t Karlsruhe / FZI nepomuk.semanticdesktop.org vo...@fz... +49 721 9654-854 www.xam.de *Second* Workshop on Semantic Wikis: http://semwiki.org/wibke2006 |