assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0080799  rdfs:subClassOf  DOID:4931  _IRI        
1          0           graph  DOID:4931     oio:id           DOID:4931  xsd:string  
1          0           graph  DOID:4930     rdfs:subClassOf  DOID:4931  _IRI        
1          0           graph  DOID:8415     rdfs:subClassOf  DOID:4931  _IRI