gModifyMessage is a virtual class to represent a modify message. Both gAddMessage and gUpdateMessage classes are inherited from gModifyMessage.
A virtual Class: No objects may be created from it.
the name of the data to be added or the name of the data that the view will visualize
a list of information needed to perform the addition
the type of addition to perform (ex. which type of model to add or which type of view to add)
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