assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:409   rdfs:subClassOf  DOID:3118  _IRI        
1          0           graph  DOID:3118  oio:id           DOID:3118  xsd:string  
1          0           graph  DOID:9741  rdfs:subClassOf  DOID:3118  _IRI