This attribute is an indicator that the element contains a
security-related notice and is used to categorize which of the
required notices is specified in the element. These categories
include those described in the CAPCO Register, as well as
additional well-defined and formally recognized security notice
types described in other directives, such as US-Person and DoD
Distribution. The element could contain any structure that
the implementing schema defines, and details of the
rendering would be relegated to the implementing schema.
The permissible value for this attribute are defined in the Controlled Value Enumeration:
CVEnumISMNotice.xml