assertion  retraction  graph  subject          predicate        object              datatype    annotation
1          0           graph  obo:CHEBI_26888  rdfs:label       tetrachlorobenzene  xsd:string  
1          0           graph  obo:CHEBI_26888  oio:id           CHEBI:26888         xsd:string  
1          0           graph  obo:CHEBI_26888  rdfs:subClassOf  obo:CHEBI_23132     _IRI        
1          0           graph  obo:CHEBI_26888  rdf:type         owl:Class           _IRI