assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:3081  rdfs:subClassOf  DOID:1475  _IRI        
1          0           graph  DOID:235   rdfs:subClassOf  DOID:1475  _IRI        
1          0           graph  DOID:1475  oio:id           DOID:1475  xsd:string  
1          0           graph  DOID:2286  rdfs:subClassOf  DOID:1475  _IRI