assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:9987  rdfs:subClassOf  DOID:4143  _IRI        
1          0           graph  DOID:9986  rdfs:subClassOf  DOID:4143  _IRI        
1          0           graph  DOID:4143  oio:id           DOID:4143  xsd:string  
1          0           graph  DOID:4141  rdfs:subClassOf  DOID:4143  _IRI