assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:4985  rdfs:subClassOf  DOID:4232  _IRI        
1          0           graph  DOID:4389  rdfs:subClassOf  DOID:4232  _IRI        
1          0           graph  DOID:4232  oio:id           DOID:4232  xsd:string