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DENOMINACIÓN de ORIGEN is the Spanish system of designating, controlling and protecting the geography and the quality of wines, often abbreviated as DO.

The model to institute a national system to define and protect Spanish wine geography began with Rioja establishing its own regulating counsel in 1926. Jerez (Sherry) and Malaga followed concurrently with the creation of a national system that has yet to achieve stability.

The DO laws have been subject to some changes due to improvements in agricultural technology, but changes have especially resulted from political turmoil within Spain as well as beaurocratic changes in the European Community. The statutes were completely re-written in 1970 and again in 1996.

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