assertion  retraction  graph  subject     predicate        object    datatype    annotation
1          0           graph  DOID:10533  rdfs:subClassOf  DOID:552  _IRI        
1          0           graph  DOID:2797   rdfs:subClassOf  DOID:552  _IRI        
1          0           graph  DOID:874    rdfs:subClassOf  DOID:552  _IRI        
1          0           graph  DOID:552    oio:id           DOID:552  xsd:string