assertion  retraction  graph  subject    predicate            object                 datatype    annotation
1          0           graph  DOID:5507  rdfs:label           clear cell ependymoma  xsd:string  
1          0           graph  DOID:5507  oio:id               DOID:5507              xsd:string  
1          0           graph  DOID:5507  oio:hasOBONamespace  disease_ontology       xsd:string  
1          0           graph  DOID:5507  rdfs:subClassOf      DOID:4844              _IRI        
1          0           graph  DOID:5507  rdf:type             owl:Class              _IRI