assertion  retraction  graph  subject             predicate        object                    datatype    annotation
1          0           graph  obo:UBERON_0013765  rdfs:label       digestive system element  xsd:string  
1          0           graph  obo:UBERON_0013765  oio:id           UBERON:0013765            xsd:string  
1          0           graph  obo:UBERON_0013765  rdfs:subClassOf  obo:UBERON_0000062        _IRI        
1          0           graph  obo:UBERON_0013765  rdf:type         owl:Class                 _IRI