Generic datum class represents a set of parameters for describing a particular datum, including a name, the reference ellipsoid used and the seven parameters required to translate co-ordinates in this datum to the WGS84 datum.

public abstract class Datum<T> : Datum
where T : new(), Datum

Public MustInherit Class Datum(Of T As {New, Datum}) _
	Inherits Datum

generic<typename T>
where T : gcnew(), Datum
public ref class Datum abstract : public Datum