assertion  retraction  graph  subject             predicate        object                          datatype    annotation
1          0           graph  obo:UBERON_0004921  rdfs:label       subdivision of digestive tract  xsd:string  
1          0           graph  obo:UBERON_0004921  oio:id           UBERON:0004921                  xsd:string  
1          0           graph  obo:UBERON_0004921  rdfs:subClassOf  obo:UBERON_0013522              _IRI        
1          0           graph  obo:UBERON_0004921  rdf:type         owl:Class                       _IRI