/**
  * Answer a reification of a statement with a given uri. If that uri already reifies a distinct
  * Statement, throw an AlreadyReifiedException.
  *
  * @param uri the URI of the resource which will reify <code>s</code>
  * @param s the Statement to reify
  * @return a reified statement object associating <code>uri</code> with <code>s</code>.
  * @throws AlreadyReifiedException if uri already reifies something else.
  */
 public ReifiedStatement createReifiedStatement(String uri, Statement s) {
   return ReifiedStatementImpl.create(model, uri, s);
 }
 /**
  * Answer a ReifiedStatement that is based on the given node.
  *
  * @param n the node which represents the reification (and is bound to some triple t)
  * @return a ReifiedStatement associating the resource of n with the statement of t.
  */
 private ReifiedStatement getRS(Node n) {
   return ReifiedStatementImpl.createExistingReifiedStatement(model, n);
 }