assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:11819  oio:id           DOID:11819  xsd:string  
1          0           graph  DOID:4939   rdfs:subClassOf  DOID:11819  _IRI        
1          0           graph  DOID:14489  rdfs:subClassOf  DOID:11819  _IRI        
1          0           graph  DOID:6886   rdfs:subClassOf  DOID:11819  _IRI