Use values of this type when you need to use an empty value that does not belong to any other type. For example, attributes with a composite value type originally have such a value. There is a single value of this type that is specified by a literal.


Availability: Thin client, web client, server, thick client, external connection, mobile application (client), mobile application (server). Server exchange is possible. Serializable. This object can be serialized to/from XDTO. In XDTO serialization Undefined has different presentations for XML elements and attributes. For elements, nil attribute of the namespace {http://www.w3.org/2001/XMLSchema-instance} is recorded with the value "true". For attributes it is defined by a missing attribute.


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