assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:1628  rdfs:subClassOf  DOID:3013  _IRI        
1          0           graph  DOID:1627  rdfs:subClassOf  DOID:3013  _IRI        
1          0           graph  DOID:6839  rdfs:subClassOf  DOID:3013  _IRI        
1          0           graph  DOID:3013  oio:id           DOID:3013  xsd:string