Metacat

   * Determine if a particular operation can be performed on an object given

   * by the Subject identified in the Session.

   * 	 

   * @param session - the Session object containing the credentials for the Subject

	 * @param pid - the object identifier for the given object to determine authorization

	 * @param operation - the permission to check for authorization

	 * 

   * @return true or false

	 * @throws InvalidToken

	 * @throws ServiceFailure

	 * @throws NotFound

	 * @throws NotAuthorized

	 * @throws NotImplemented

	 * @throws InvalidRequest

   */

	public boolean isAuthorized(Session session, Identifier pid, Permission operation)

	  throws ServiceFailure, InvalidRequest, InvalidToken, NotFound,

	  NotAuthorized, NotImplemented {

		return false;

	}

	/**