assertion  retraction  graph  subject    predicate                                         object     datatype    annotation
1          0           graph  DOID:3204  <http://www.w3.org/2004/02/skos/core#exactMatch>  NCI:C6557  xsd:string  
1          0           graph  DOID:3204  oio:hasDbXref                                     NCI:C6557  xsd:string