assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:2526  oio:id           DOID:2526  xsd:string  
1          0           graph  DOID:3703  rdfs:subClassOf  DOID:2526  _IRI        
1          0           graph  DOID:3504  rdfs:subClassOf  DOID:2526  _IRI        
1          0           graph  DOID:3024  rdfs:subClassOf  DOID:2526  _IRI        
1          0           graph  DOID:7246  rdfs:subClassOf  DOID:2526  _IRI