assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0080525  oio:id           DOID:0080525  xsd:string  
1          0           graph  DOID:3969     rdfs:subClassOf  DOID:0080525  _IRI        
1          0           graph  DOID:3962     rdfs:subClassOf  DOID:0080525  _IRI