assertion  retraction  graph  subject             predicate        object              datatype    annotation
1          0           graph  obo:UBERON_0000055  rdfs:label       vessel              xsd:string  
1          0           graph  obo:UBERON_0000055  oio:id           UBERON:0000055      xsd:string  
1          0           graph  obo:UBERON_0000055  rdfs:subClassOf  obo:UBERON_0004111  _IRI        
1          0           graph  obo:UBERON_0000055  rdf:type         owl:Class           _IRI