assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0080881 IAO:0000115 An anaplastic pleomorphic xanthoastrocytoma that has_material_basis_in BRAF mutations. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.futuremedicine.com/doi/10.2217/cns-2019-0009""}]}"