A composite key may be modelled by a .NET class with a property for each key column. The class must be Serializable and override equals() and hashCode() Namespace used to find not-Fully Qualified Type Names Assembly used to find not-Fully Qualified Type Names Set the default timeout in seconds for the underlying ADO.NET query. Set the default timeout in seconds for the underlying ADO.NET query. undefined|any|none|null|0|-1|... The concrete collection should use a generic version or an object-based version. Types of polymorphism Obsolete, please use manual instead.