assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:1532     rdfs:subClassOf  DOID:0050161  _IRI        
1          0           graph  DOID:850      rdfs:subClassOf  DOID:0050161  _IRI        
1          0           graph  DOID:0050161  oio:id           DOID:0050161  xsd:string  
1          0           graph  DOID:1176     rdfs:subClassOf  DOID:0050161  _IRI