assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080616  oio:id           DOID:0080616  xsd:string  
1          0           graph  DOID:0080615  rdfs:subClassOf  DOID:0080616  _IRI        
1          0           graph  DOID:7571     rdfs:subClassOf  DOID:0080616  _IRI