assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4921  oio:id           DOID:4921  xsd:string  
1          0           graph  DOID:4920  rdfs:subClassOf  DOID:4921  _IRI        
1          0           graph  DOID:5569  rdfs:subClassOf  DOID:4921  _IRI        
1          0           graph  DOID:7566  rdfs:subClassOf  DOID:4921  _IRI        
1          0           graph  DOID:7960  rdfs:subClassOf  DOID:4921  _IRI