assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4845  rdfs:subClassOf  DOID:4851  _IRI        
1          0           graph  DOID:6812  rdfs:subClassOf  DOID:4851  _IRI        
1          0           graph  DOID:6811  rdfs:subClassOf  DOID:4851  _IRI        
1          0           graph  DOID:4851  oio:id           DOID:4851  xsd:string