code: @Override
      public void unset(String propName) {
  
          /*
           * Require a property name.
           */
          if (propName == null || propName.trim().isEmpty()) {
              return;
          }
  
          if (propName.equals(PROP_MEMBERS)) {
              unsetMembers();
          }
          if (propName.equals(PROP_DISPLAY_NAME)) {
              unsetDisplayName();
          }
          if (propName.equals(PROP_DESCRIPTION)) {
              unsetDescription();
          }
          if (propName.equals(PROP_BUSINESS_CATEGORY)) {
              unsetBusinessCategory();
          }
          if (propName.equals(PROP_SEE_ALSO)) {
              unsetSeeAlso();
          }
  
          if (extendedPropertiesDataType.containsKey(propName))
              unSetExtendedProperty(propName);
  
          super.unset(propName);
      }
docs: Sets the value of provided property to null.
  
  @param propName
  allowed object is {@link String}