Datum 类

public class Datum : IDatum, IEqual, 
	IDatumEdit, ICloneable

Public Class Datum
	Implements IDatum, IEqual, IDatumEdit, ICloneable

public ref class Datum : IDatum, IEqual, 
	IDatumEdit, ICloneable

type Datum =  
    class
        interface IDatum
        interface IEqual
        interface IDatumEdit
        interface ICloneable
    end