"2008-05-xx" . _:vb50999598 "Sean Bechhofer" . "semantic relation"@en . . _:vb50999598 "Initial description." . _:vb50999598 . "This property should not be used directly, but as a super-property for all properties denoting a relationship of meaning between concepts."@en . _:vb50999598 . "A concept related by meaning."@en . . _:vb50999598 "2008-05-xx" . . . .