assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:0070003  oio:id           DOID:0070003  xsd:string  
1          0           graph  DOID:0081244  rdfs:subClassOf  DOID:0070003  _IRI        
1          0           graph  DOID:4765     rdfs:subClassOf  DOID:0070003  _IRI