assertion  retraction  graph  subject  predicate            object                           datatype    annotation
1          0           graph  DOID:77  rdfs:label           gastrointestinal system disease  xsd:string  
1          0           graph  DOID:77  oio:hasExactSynonym  digestive system disorder        @en         
1          0           graph  DOID:77  oio:hasDbXref        UMLS_CUI:C0012242                xsd:string