docs: public LdapRdn getLdapRdn(String key) {
  		for (Iterator iter = names.iterator(); iter.hasNext();) {
  			LdapRdn rdn = (LdapRdn) iter.next();
  			if (ObjectUtils.nullSafeEquals(rdn.getKey(), key)) {
  				return rdn;
  			}
  		}
  
  		throw new IllegalArgumentException("No Rdn with the requested key: '" + key + "'");
  	}