assertion  retraction  graph  subject             predicate        object              datatype    annotation
1          0           graph  obo:UBERON_0000167  rdfs:label       oral cavity         xsd:string  
1          0           graph  obo:UBERON_0000167  oio:id           UBERON:0000167      xsd:string  
1          0           graph  obo:UBERON_0000167  rdfs:subClassOf  obo:UBERON_0002553  _IRI        
1          0           graph  obo:UBERON_0000167  rdf:type         owl:Class           _IRI