assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4645  oio:id           DOID:4645  xsd:string  
1          0           graph  DOID:774   rdfs:subClassOf  DOID:4645  _IRI        
1          0           graph  DOID:8427  rdfs:subClassOf  DOID:4645  _IRI        
1          0           graph  DOID:771   rdfs:subClassOf  DOID:4645  _IRI        
1          0           graph  DOID:5240  rdfs:subClassOf  DOID:4645  _IRI