assertion  retraction  graph  subject       predicate        object      datatype    annotation
1          0           graph  DOID:0050919  rdfs:subClassOf  DOID:11920  _IRI        
1          0           graph  DOID:11920    oio:id           DOID:11920  xsd:string  
1          0           graph  DOID:4876     rdfs:subClassOf  DOID:11920  _IRI        
1          0           graph  DOID:12002    rdfs:subClassOf  DOID:11920  _IRI        
1          0           graph  DOID:12001    rdfs:subClassOf  DOID:11920  _IRI