assertion  retraction  graph  subject     predicate        object     datatype    annotation
1          0           graph  DOID:3445   oio:id           DOID:3445  xsd:string  
1          0           graph  DOID:13159  rdfs:subClassOf  DOID:3445  _IRI        
1          0           graph  DOID:3444   rdfs:subClassOf  DOID:3445  _IRI        
1          0           graph  DOID:4278   rdfs:subClassOf  DOID:3445  _IRI