assertion  retraction  graph  subject              predicate        object         datatype  annotation
1          0           graph  obo:FOODON_00002403  rdfs:label       food material  @en       
1          0           graph  obo:FOODON_00002403  rdfs:subClassOf  owl:Thing      _IRI      
1          0           graph  obo:FOODON_00002403  rdf:type         owl:Class      _IRI