This classification is based on a private law statute of the VDP (Verband deutscher Prädikatsweingüter) and has no legislative function. It is a declared aim to restore the value of Germany's best sites(individual vineyards), to ensure the preservation of a unique cultural landscape, to regain the status of great dry wines from Germany and to emphasise the importance of the traditional fruit-sweet Prädikat wines. The statute defines the quality of a wine according to the internationally widely used term "terroir", i.e. the origin in connection with the quality. The principle "The closer (smaller) the origin, the higher the quality" applies. The quality of the vineyard is defined by the soil with topographical location and the prevailing climate or microclimate (see also under Wine growing quality).