assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:5529  rdfs:subClassOf  DOID:293  _IRI        
1          0           graph  DOID:298   rdfs:subClassOf  DOID:293  _IRI        
1          0           graph  DOID:293   oio:id           DOID:293  xsd:string