assertion  retraction  graph  subject       predicate        object        datatype    annotation
1          0           graph  DOID:4607     rdfs:subClassOf  DOID:0080355  _IRI        
1          0           graph  DOID:0080355  oio:id           DOID:0080355  xsd:string  
1          0           graph  DOID:3571     rdfs:subClassOf  DOID:0080355  _IRI