assertion  retraction  graph  subject    predicate        object   datatype    annotation
1          0           graph  DOID:18    oio:id           DOID:18  xsd:string  
1          0           graph  DOID:1426  rdfs:subClassOf  DOID:18  _IRI        
1          0           graph  DOID:557   rdfs:subClassOf  DOID:18  _IRI        
1          0           graph  DOID:732   rdfs:subClassOf  DOID:18  _IRI        
1          0           graph  DOID:3996  rdfs:subClassOf  DOID:18  _IRI        
1          0           graph  DOID:731   rdfs:subClassOf  DOID:18  _IRI        
1          0           graph  DOID:365   rdfs:subClassOf  DOID:18  _IRI