assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:9074     rdfs:subClassOf  DOID:8857  _IRI        
1          0           graph  DOID:0050169  rdfs:subClassOf  DOID:8857  _IRI        
1          0           graph  DOID:8857     oio:id           DOID:8857  xsd:string  
1          0           graph  DOID:0040093  rdfs:subClassOf  DOID:8857  _IRI