code: @Override
      public String evaluate(String request) throws PEPException {
          if (logger.isDebugEnabled()) {
              logger.debug("Resolving String request:\n" + request);
          }
  
          String response = null;
          try {
              response = this.client.evaluate(request);
          } catch (Exception e) {
              logger.error("Error evaluating request.", e);
              throw new PEPException("Error evaluating request", e);
          }
  
          return response;
      }
docs: /*
  (non-Javadoc)
  @see org.fcrepo.server.security.xacml.pep.PEPClient#evaluate(java.lang.String)