Switchboards make that possible. The only way a user can change his DTD is by modifying the switch file. The advantages Only foreseen and approved content models can be created. But it is not to the regulator. All mistakes, misspellings, misnumberings, misstructures must be preserved.
Laws have long life cycles.
Editorial views change. Because laws change frequently, many publications are loose leaf. Our batch pagination system can't handle tranformations very well, certainly not across page boundaries. If the order changes during a publication's lifecycle, both orders must be allowed. Kluwer Law and Kluwer Professional publishers merged again.