ISO 4217 or banking. At the 17th session (February 1978), the related UN/ECE Group of Experts agreed that the three-letter alphabetic codes for International Standard ISO 4217, "Codes for the representation of currencies and funds", would be suitable for use in international trade. Over time, new currencies are created and old currencies are discontinued. Frequently, these changes are due to the formation of new governments, treaties between countries standardizing on a shared currency, or revaluation of an existing currency due to excessive inflation. As a result, the list of codes must be updated from time to time. The ISO 4217 maintenance agency
International Organization for Standardization ""ISO[/IEC] Guide N:yyyy: Title"".For example: ISO documents are copyrighted and ISO charges for most copies. It does not, however, charge for most draft copies of documents in electronic format. Although they are useful, care must be taken using these drafts as there is the possibility of substantial change before they become finalized as standards. Some standards by ISO and its official U.S. representative (and, via the U.S. National Committee, the International Electrotechnical Commission) are made freely available. A standard published by ISO/IEC is the last stage of a long process that commonly starts with the proposal of new work within