code: @Override
      public boolean isSet(String propName) {
  
          /*
           * Require a property name.
           */
          if (propName == null || propName.trim().isEmpty()) {
              return false;
          }
  
          if (propName.equals(PROP_CN)) {
              return isSetCn();
          }
          if (propName.equals(PROP_MEMBERS)) {
              return isSetMembers();
          }
          if (propName.equals(PROP_DISPLAY_NAME)) {
              return isSetDisplayName();
          }
          if (propName.equals(PROP_DESCRIPTION)) {
              return isSetDescription();
          }
          if (propName.equals(PROP_BUSINESS_CATEGORY)) {
              return isSetBusinessCategory();
          }
          if (propName.equals(PROP_SEE_ALSO)) {
              return isSetSeeAlso();
          }
  
          if (extendedPropertiesDataType.containsKey(propName))
              return isSetExtendedProperty(propName);
  
          return super.isSet(propName);
      }
docs: Returns true if the requested property is set; false, otherwise.
  
  @return
  returned object is {@link boolean }