If Updates are Allowed, Indicate here what structural changes, if any, are permissible within a version. Note whether Classification Items can be added to the structure and whether they can be revalidated or invalidated. Such changes are more likely to be permissible in floating classifications. Also indicate whether changes to such things as Classification Item names and explanatory notes that do not involve structural changes are permissible within a version. Supports the use of multiple languages and structured content.