code: private Node nodeFor( ITransaction transaction,
                            ResolvedRequest request ) throws RepositoryException {
          return ((JcrSessionTransaction)transaction).nodeFor(request);
      }
docs: Get the node that corresponds to the resolved request, using the supplied active transaction.
  
  @param transaction the active transaction; may not be null
  @param request the resolved request; may not be null and must contain a repository name and workspace name
  @return the node; never null
  @throws RepositoryException if the node does not exist, or if there is another problem obtaining the node