assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:10190 IAO:0000115 A lipoma located in the liver. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://radiopaedia.org/articles/hepatic-lipoma-2?lang=us""}]}"