A bag permits duplicates, so it has no primary key

Namespace: NHibernate.Mapping
Assembly:   NHibernate (in NHibernate)
Version: 1.2.0.4000

Syntax

Visual Basic (Declaration)
Public Class Bag _
	Inherits Collection
C#
public class Bag : Collection
Visual C++
public ref class Bag : public Collection

Inheritance Hierarchy

System.Object
  NHibernate.Mapping.Collection
    NHibernate.Mapping.Bag