[SerializableAttribute]
public class AnyType : AbstractType, IAbstractComponentType, 
	IAssociationType, IType, ICacheAssembler

<SerializableAttribute> _
Public Class AnyType _
	Inherits AbstractType _
	Implements IAbstractComponentType, IAssociationType, IType, ICacheAssembler

[SerializableAttribute]
public ref class AnyType : public AbstractType, 
	IAbstractComponentType, IAssociationType, IType, ICacheAssembler

The identifierType is any NHibernate IType that can be serailized by default. For example, you can specify the identifierType as an Int32 or a custom identifier type that you built. The identifierType matches to one or many columns. The metaType maps to a single column. By default it stores the name of the Type that the Identifier identifies. For example, we can store a link to any table. It will have the results class_name id_col1 ======================================== Simple, AssemblyName 5 DiffClass, AssemblyName 5 Simple, AssemblyName 4 You can also provide you own type that might map the name of the class to a table with a giant switch statemet or a good naming convention for your class->table. The data stored might look like class_name id_col1 ======================================== simple_table 5 diff_table 5 simple_table 4

System..::..Object
  NHibernate.Type..::..AbstractType
    NHibernate.Type..::..AnyType