A common metadata format is the base starting point. From this we can begin to expand and add more attributes to the metadata. This includes a classification review period, a succession label to be used after the review period has passed, the identity of the person assigning the classification. The standards has been written in such a way that new attributes can easily be added without breaking previous versions. Cryptographic binding of the classification metadata to the data ensures integrity of the label and the data in more secure environments, and the future inclusion for post-release protection ensures the data can be released for a number of days, after which the data cannot be accessed.