assertion  retraction  graph  subject       predicate        object     datatype    annotation
1          0           graph  DOID:0070323  rdfs:subClassOf  DOID:7757  _IRI        
1          0           graph  DOID:7757     oio:id           DOID:7757  xsd:string  
1          0           graph  DOID:7756     rdfs:subClassOf  DOID:7757  _IRI