assertion  retraction  graph  subject    predicate            object                               datatype    annotation
1          0           graph  DOID:7994  rdfs:label           central nervous system osteosarcoma  xsd:string  
1          0           graph  DOID:7994  oio:inSubset         obo:doid#NCIthesaurus                _IRI        
1          0           graph  DOID:7994  oio:id               DOID:7994                            xsd:string  
1          0           graph  DOID:7994  oio:hasOBONamespace  disease_ontology                     xsd:string  
1          0           graph  DOID:7994  oio:hasDbXref        UMLS_CUI:C1335150                    xsd:string  
1          0           graph  DOID:7994  oio:hasDbXref        NCI:C7002                            xsd:string  
1          0           graph  DOID:7994  rdfs:subClassOf      DOID:502                             _IRI        
1          0           graph  DOID:7994  rdf:type             owl:Class                            _IRI