assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050890  rdfs:subClassOf  DOID:1289  _IRI        
1          0           graph  DOID:1289     oio:id           DOID:1289  xsd:string  
1          0           graph  DOID:231      rdfs:subClassOf  DOID:1289  _IRI        
1          0           graph  DOID:680      rdfs:subClassOf  DOID:1289  _IRI