assertion  retraction  graph  subject    predicate        object     datatype    annotation
1          0           graph  DOID:5923  rdfs:subClassOf  DOID:4897  _IRI        
1          0           graph  DOID:5537  rdfs:subClassOf  DOID:4897  _IRI        
1          0           graph  DOID:4897  oio:id           DOID:4897  xsd:string  
1          0           graph  DOID:4896  rdfs:subClassOf  DOID:4897  _IRI        
1          0           graph  DOID:3494  rdfs:subClassOf  DOID:4897  _IRI