assertion  retraction  graph  subject         predicate        object           datatype    annotation
1          0           graph  NCBITaxon:7711  rdfs:label       Chordata         xsd:string  
1          0           graph  NCBITaxon:7711  rdfs:subClassOf  NCBITaxon:33511  _IRI        
1          0           graph  NCBITaxon:7711  rdf:type         owl:Class        _IRI