| http://www.w3.org/ns/prov#value | - For example, the user may be prompted to manually provide identifying information for products, such as a name, description, or UPC (???Universal Product Code???) or other code; a wand or scanner may be used to scan a UPC or other code from an already-purchased product or from a catalog, advertisement, coupon, or other literature; identifying information may be retrieved from an on-line source suc
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