assertion  retraction  graph  subject     predicate        object    datatype    annotation
1          0           graph  DOID:956    oio:id           DOID:956  xsd:string  
1          0           graph  DOID:11888  rdfs:subClassOf  DOID:956  _IRI        
1          0           graph  DOID:6735   rdfs:subClassOf  DOID:956  _IRI        
1          0           graph  DOID:6564   rdfs:subClassOf  DOID:956  _IRI        
1          0           graph  DOID:6175   rdfs:subClassOf  DOID:956  _IRI