assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050906  rdfs:subClassOf  DOID:4251  _IRI        
1          0           graph  DOID:5467     rdfs:subClassOf  DOID:4251  _IRI        
1          0           graph  DOID:5465     rdfs:subClassOf  DOID:4251  _IRI        
1          0           graph  DOID:4251     oio:id           DOID:4251  xsd:string