URL</code>         /// parameter, but not both.</para><para>You might update the stack policy, for example, in order to protect a new resource         /// that you created during a stack update. If you do not specify a stack policy, the         /// current policy that is associated with the stack is unchanged.</para>         /// </para>         /// </summary>         [System.Management.Automation.Parameter(ValueFromPipelineByPropertyName = true)]         public System.String StackPolicyURL { get; set; }         #endregion                  #region Parameter T