assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:6190  rdfs:subClassOf  DOID:1995  _IRI        
1          0           graph  DOID:1995  oio:id           DOID:1995  xsd:string  
1          0           graph  DOID:5297  rdfs:subClassOf  DOID:1995  _IRI        
1          0           graph  DOID:4053  rdfs:subClassOf  DOID:1995  _IRI