assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0050908  rdfs:subClassOf  DOID:4960  _IRI        
1          0           graph  DOID:0070004  rdfs:subClassOf  DOID:4960  _IRI        
1          0           graph  DOID:0050750  rdfs:subClassOf  DOID:4960  _IRI        
1          0           graph  DOID:4960     oio:id           DOID:4960  xsd:string