ClassMetaType is a NH specific type to support "any" with meta-type="class"
            
Namespace: NHibernate.TypeAssembly: NHibernate (in NHibernate.dll) Version: 3.2.0.4000 (3.2.0.4000)
Syntax
| C# | 
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[SerializableAttribute] public class ClassMetaType : AbstractType  | 
| Visual Basic | 
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<SerializableAttribute> _ Public Class ClassMetaType _ Inherits AbstractType  | 
| Visual C++ | 
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[SerializableAttribute] public ref class ClassMetaType : public AbstractType  | 
Remarks
            It work like a MetaType where the key is the entity-name it self