assertion retraction graph subject predicate object datatype annotation 1 0 graph obo:SYMP_0000900 IAO:0000115 An immune system symptom that is characterized by sensitivities to substances called allergens. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://medlineplus.gov/ency/article/000005.htm""}]}"