assertion  retraction  graph  subject        predicate        object            datatype    annotation
1          0           graph  NCBITaxon:235  rdfs:label       Brucella abortus  xsd:string  
1          0           graph  NCBITaxon:235  rdfs:subClassOf  OBI:0100026       _IRI        
1          0           graph  NCBITaxon:235  rdf:type         owl:Class         _IRI