assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:10944 IAO:0000115 A mouth disease located_in the tongue. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://medlineplus.gov/tonguedisorders.html""}]}"