assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0060531 IAO:0000115 A snail allergy triggered by the horned turban snail. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://farrp.unl.edu/informallmollshellfish""}]}"