assertion  retraction  graph  subject    predicate        object    datatype    annotation
1          0           graph  DOID:2537  rdfs:subClassOf  DOID:870  _IRI        
1          0           graph  DOID:5656  rdfs:subClassOf  DOID:870  _IRI        
1          0           graph  DOID:870   oio:id           DOID:870  xsd:string  
1          0           graph  DOID:440   rdfs:subClassOf  DOID:870  _IRI        
1          0           graph  DOID:2491  rdfs:subClassOf  DOID:870  _IRI