assertion  retraction  graph  subject    predicate     object  datatype    annotation
1          0           graph  DOID:2355  rdfs:comment  PRISM.  xsd:string  
1          0           graph  DOID:1074  rdfs:comment  PRISM.  xsd:string  
1          0           graph  DOID:9477  rdfs:comment  PRISM.  xsd:string