A list or action list object.
A general lisp object.
macro adds a new action to the specified list; this action will be executed according to the action-list's execution-function (see
) when executed. If the action-list specified by
does not exist, then this is handled according to the value of *handle-missing-action-list*.
is evaluated to give either a list UID (to be looked up in the global registry of lists) or an action list object.
is a UID (general lisp object, to be compared by
). It uniquely identifies this action within its list (as opposed to among all lists).
Action-items are normally expected not to be redefined. If an action-item with that action-name already exists in the action-list (that is, one with an identifier
to the action-name), then the notification and subsequent handling of this attempt is controlled by the values in the list *handle-existing-action-in-action-list*. This is to prevent problems due to re-evaluating an action definition inappropriately. Notification and redefine behavior can be overridden by using the
keyword argument. In this case, any required redefinition is performed unconditionally and without notification.
The following element in
is a UID.
specifies that the action-item being defined must be run after the action-item named. If there is no action-item with a matching name, the restriction is ignored.
, but this action-item must be run before the one specified.
Specifies that this action-item should be executed only once; after execution, it is disabled.
Specifies that this definition should override any previous definition of this action-item, rather than be subject to the value of *handle-existing-action-in-action-list*.