assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:4618 IAO:0000115 A jaw cancer that effects the maxilla or upper jaw. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2654824/""}]}"