Specifies the data definition used for a serial object.
The value of this element is the name of a data definition within this storage definition.
For a serial (embedded) class, this keyword indicates which data definition is used to define the serialized state of the object (how the object’s properties are arranged when they are serialized). This is also the default DATA definition to which the default structure generator will add unstored properties.
The default value for the <State> element is an empty string.