assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:2996  rdfs:subClassOf  DOID:154  _IRI        
1          0           graph  DOID:4236  rdfs:subClassOf  DOID:154  _IRI        
1          0           graph  DOID:154   oio:id           DOID:154  xsd:string  
1          0           graph  DOID:5088  rdfs:subClassOf  DOID:154  _IRI