assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:9182     rdfs:subClassOf  DOID:8502  _IRI        
1          0           graph  DOID:0080841  rdfs:subClassOf  DOID:8502  _IRI        
1          0           graph  DOID:2731     rdfs:subClassOf  DOID:8502  _IRI        
1          0           graph  DOID:8505     rdfs:subClassOf  DOID:8502  _IRI        
1          0           graph  DOID:8502     oio:id           DOID:8502  xsd:string