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Any CBEFF Standard Biometric Header in a CBEFF nested structure that follows the Root Header and pre cedes one or more Basic Data Structures. A CBEFF Sub-Header is not immediately followed by a Biometric Data Block.
Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.
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Also see Draft NISTIR 7298 Rev. 3 for additional details.