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Represents a typed value. The value can contain nested intrinsic functions.

This model can be used as the ``container_holder`` argument for :func:`functions.evaluate`.

:ivar name: Nameunique name in factory
:vartype name: basestring
:ivar type_name: Typetype name from factory type registrar
:vartype type_name: basestring
:ivar value: Valuevalue; cannot be ``None``
:ivar description: DescriptionEnglish one-line description
:vartype description: basestring