assertion  retraction  graph  subject       predicate          object                datatype    annotation
1          0           graph  DOID:0050737  oio:creation_date  2012-07-24T12:51:47Z  xsd:string  
1          0           graph  DOID:0050736  oio:creation_date  2012-07-24T12:51:47Z  xsd:string