assertion  retraction  graph  subject    predicate            object                  datatype    annotation
1          0           graph  DOID:8256  rdfs:label           olfactory neural tumor  xsd:string  
1          0           graph  DOID:8256  oio:id               DOID:8256               xsd:string  
1          0           graph  DOID:8256  oio:hasOBONamespace  disease_ontology        xsd:string  
1          0           graph  DOID:8256  rdfs:subClassOf      DOID:370                _IRI        
1          0           graph  DOID:8256  rdf:type             owl:Class               _IRI