| http://www.w3.org/ns/prov#value | - Besides the user actively deleting items, the principle of the invention also includes an expiration date for some of the products entered such as perishables and ready-to-consume items as certain foods, drugs, cosmetics, and so on, so that the stored database for the user does not grow too large and products are not kept in the database for an excessive period of time. [0159] Furthermore if a use
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