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ded:Definition: A subtitle may be any form of the title used as a substitute,
or it may be an alternative to the formal title of the resource. A subtitle may
be any form of the title used as a substitute, or it may be an alternative to
the formal title of the resource. See also, IRM Spec Category:
Title.
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ded:Obligation: (Optional)
ded:Comment: There is no maximum number of subtitle elements. subtitle must be
marked according to SMP guidelines.