assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:6041 IAO:0000115 A malignant choroid melanoma that is located_in the choroid. xsd:string "{""dce:type"":[{""datatype"":""_IRI"",""meta"":""owl:Axiom"",""object"":""obo:ECO_0007637""}],""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:http://www.cancer.gov/cancertopics/pdq/treatment/intraocularmelanoma/HealthProfessional/allpages/print""}]}"