assertion  retraction  graph  subject       predicate          object                datatype    annotation
1          0           graph  DOID:0060089  oio:creation_date  2011-07-14T01:45:15Z  xsd:string  
1          0           graph  DOID:0060091  oio:creation_date  2011-07-14T01:45:15Z  xsd:string  
1          0           graph  DOID:0060090  oio:creation_date  2011-07-14T01:45:15Z  xsd:string