assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5545  rdfs:subClassOf  DOID:4551  _IRI        
1          0           graph  DOID:5134  rdfs:subClassOf  DOID:4551  _IRI        
1          0           graph  DOID:4551  oio:id           DOID:4551  xsd:string  
1          0           graph  DOID:4550  rdfs:subClassOf  DOID:4551  _IRI