(6.4.2.1.2 - 6.4.2.1.4 Format Description) (Optional)
CONTAINS
A CHOICE OF 1 OUT OF 2 ELEMENTS:
{ 6.4.2.1.2 Format Version Number (Mandatory)
OR
6.4.2.1.3 Format Version Date (Mandatory) }
AND
6.4.2.1.4 Format Specification (Optional)
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