The DOC (Denominazione di Origine Controllata) identifies wines that are made in compliance with the production specifications established by law. The specification establishes the exact limits of the geographical area from which the grapes may originate, the characteristics of the vineyard soils, the vine cultivation techniques, the grape varieties that may be used and their percentages, the maximum yield of grapes per hectare, the yield of grapes in wine, acidity, and dry extract. It also defines the minimum alcohol content, the possibility and relative regulation of winemaking and bottling outside the area of origin, the technique and timing of aging, and special practices to which the wine may or must be subjected.