assertion retraction graph subject predicate object datatype annotation 1 0 graph DOID:0050156 IAO:0000115 A pulmonary fibrosis that is characterized by scarring of the lung. xsd:string "{""oio:hasDbXref"":[{""datatype"":""xsd:string"",""meta"":""owl:Axiom"",""object"":""url:https://www.pulmonaryfibrosis.org/life-with-pf/about-ipf""}]}"