public interface GroupSelector {
  /**
   * Method used by GroupDefiner to obtains the GroupType of the Group Selection Module
   * 
   * @return The GroupType of the Group Selection Module
   */
  public int getGroupType();

  /**
   * Processes the Mobile Node´s group membership using the Context Update (CxtU) message
   * 
   * @param nodeMessage Context Update (CxtU) message produced by Mobile Node
   * @return A set that holds the Mobile Node´s group membership
   */
  public Set<Integer> processGroups(Message nodeMessage);
}