assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0080320 IAO:0000115 A central nervous system benign neoplasm the is located_in the peripheral nervous system. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.mayoclinic.org/diseases-conditions/peripheral-nerve-tumors-benign/symptoms-causes/syc-20368680""}]}"