assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:2664  oio:id           DOID:2664  xsd:string  
1          0           graph  DOID:5876  rdfs:subClassOf  DOID:2664  _IRI        
1          0           graph  DOID:3896  rdfs:subClassOf  DOID:2664  _IRI        
1          0           graph  DOID:2661  rdfs:subClassOf  DOID:2664  _IRI        
1          0           graph  DOID:2065  rdfs:subClassOf  DOID:2664  _IRI        
1          0           graph  DOID:173   rdfs:subClassOf  DOID:2664  _IRI