assertion  retraction  graph  subject     predicate        object    datatype    annotation
1          0           graph  DOID:12359  rdfs:subClassOf  DOID:930  _IRI        
1          0           graph  DOID:930    oio:id           DOID:930  xsd:string  
1          0           graph  DOID:4143   rdfs:subClassOf  DOID:930  _IRI