Adds a parameter to the request.
Returns the body of the request (the expression to be evaluated).
Returns the unique identifier (ARID) of the request.
Returns the note attached to the request, or an empty string if none exists.
Returns the date attached to the request, if any.
Returns the function of the request.
Returns the expression envelope of the request.
Converts the request to an envelope.
Interface that defines the behavior of a request.
This interface extends expression behavior to add methods specific to requests, including metadata management and access to request properties.