assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:7160     rdfs:subClassOf  DOID:1984  _IRI        
1          0           graph  DOID:0050915  rdfs:subClassOf  DOID:1984  _IRI        
1          0           graph  DOID:1984     oio:id           DOID:1984  xsd:string  
1          0           graph  DOID:6459     rdfs:subClassOf  DOID:1984  _IRI