assertion  retraction  graph  subject          predicate        object       datatype    annotation
1          0           graph  obo:CHEBI_60004  rdfs:label       mixture      xsd:string  
1          0           graph  obo:CHEBI_60004  rdfs:subClassOf  COB:0000006  _IRI        
1          0           graph  obo:CHEBI_60004  rdf:type         owl:Class    _IRI