assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:7192     rdfs:subClassOf  DOID:4455  _IRI        
1          0           graph  DOID:0050387  rdfs:subClassOf  DOID:4455  _IRI        
1          0           graph  DOID:4455     oio:id           DOID:4455  xsd:string  
1          0           graph  DOID:6163     rdfs:subClassOf  DOID:4455  _IRI