assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0050688  oio:id           DOID:0050688  xsd:string  
1          0           graph  DOID:6126     rdfs:subClassOf  DOID:0050688  _IRI        
1          0           graph  DOID:3692     rdfs:subClassOf  DOID:0050688  _IRI        
1          0           graph  DOID:7177     rdfs:subClassOf  DOID:0050688  _IRI