assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:10547  rdfs:subClassOf  DOID:10544  _IRI        
1          0           graph  DOID:10544  oio:id           DOID:10544  xsd:string  
1          0           graph  DOID:6703   rdfs:subClassOf  DOID:10544  _IRI