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JULY

Definition:This word, or the adjective ?OPTIONAL?, means that an item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because the vendor feels that it enhances the product while another vendor may omit the same item. An implementation which does not include a particular option MUST be prepared to interoperate with another implementation which does include the option, though perhaps with reduced functionality. In the same vein an implementation which does include a particular option. MUST be prepared to interoperate with another implementation which does not include the option (except, of course, for the feature the option provides). Source:Commission Regulation 2006/62/EC concerning the TSI relating to the telematic application for freight subsystem of the trans-European conventional rail system