code: public ICriterion<TokenClientParam> hasSystemWithAnyCode(String theSystem) {
  		return new TokenCriterion(getParamName(), theSystem, (String) null);
  	}
docs: Create a search criterion that matches against the given system
  value but does not specify a code. This means that any code/identifier with
  the given system should match.
  <p>
  Use {@link #exactly()} if you want to specify a code.
  </p>