This attribute is used at
both the resource and the portion levels. A single indicator of the highest
level of classification applicable to an information resource or portion within
the domain of classified national security information. The Classification
element is always used in conjunction with the Owner Producer element. Taken
together, the two elements specify the classification category and the type of
classification (US, non-US, or Joint). It is manifested in portion marks and
security banners. PERMISSIBLE VALUES The permissible values for this simple type
are defined in the Controlled Value Enumeration: CVEnumISMClassificationAll.xml