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"In order to improve the quality of the tourist offer, ensure the protection of tourists and combat irregular forms of hospitality, including for tax purposes, a specific database of accommodation facilities has been set up at the Ministry of Agricultural, Food, Forestry and Tourism Policies as well as properties intended for short-term leases pursuant to article 4 of the decree-law of 24 April 2017, no. 50, converted, with amendments, by law 21 June 2017, n. 96, present in the national territory, identified by an alphanumeric code, hereinafter referred to as the "identification code", to be used in any communication relating to the offer and promotion of services to users ".