Represents an event listener for calculating default values.
DefaultValueListener is one of the default listeners which are being registered for all data models.
A data field may have a default value attribute.
An instance of FunctionContext class will calculate this value by evaluating the expression provided.
The default value listener will process all fields of an inserted data object which have a default value expression and does not have a defined value.
"title": "Created By",
Note: FunctionContext class may be extended in order to allow applications to perform value calculations.