assertion  retraction  graph  subject         predicate        object          datatype    annotation
1          0           graph  NCBITaxon:3505  rdfs:label       Betula pendula  xsd:string  
1          0           graph  NCBITaxon:3505  rdfs:subClassOf  OBI:0100026     _IRI        
1          0           graph  NCBITaxon:3505  rdf:type         owl:Class       _IRI