assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4995  oio:id           DOID:4995  xsd:string  
1          0           graph  DOID:8179  rdfs:subClassOf  DOID:4995  _IRI        
1          0           graph  DOID:8178  rdfs:subClassOf  DOID:4995  _IRI        
1          0           graph  DOID:8177  rdfs:subClassOf  DOID:4995  _IRI