sentences:  The European standard for ticketing data (EN1545) has also been contributed by the actors of Calypso.After a few years of trials, the system has been generalised in the early 2000s in major European cities such as Strasbourg, Paris, Venice, Lisbon, later followed by Turin, Porto, Marseille, Lyon, and many smaller cities.Calypso is extended now in other countries such as Belgium, Israel, Canada, Mexico, Colombia, etc.