Message in Spanish (Español)
El tipo de entidad '<var>Type Name</var>' del DomainService '<var>X</var>' es abstracto y debe utilizar un KnownTypeAttribute para especificar al menos un tipo derivado no abstracto.
Unlocalized message
The entity type '<var>Type Name</var>' in the DomainService '<var>X</var>' is abstract and must use a KnownTypeAttribute to specify at least one non-abstract derived type.
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