assertion  retraction  graph  subject            predicate        object       datatype    annotation
1          0           graph  NCBITaxon:no_rank  rdfs:label       no rank      xsd:string  
1          0           graph  NCBITaxon:no_rank  rdfs:subClassOf  IAO:0000030  _IRI        
1          0           graph  NCBITaxon:no_rank  rdf:type         owl:Class    _IRI