assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0080888  rdfs:subClassOf  DOID:5503  _IRI        
1          0           graph  DOID:5503     oio:id           DOID:5503  xsd:string  
1          0           graph  DOID:7788     rdfs:subClassOf  DOID:5503  _IRI