Google Changes Product Feed Requirements
Google is making some changes to its data requirements and feed specifications in order to help Google Product Search shoppers accurately compare prices and learn more about products they want to buy. The changes affect only Google Product Search listings and will not apply to Google Commerce Search or AdWords ad formats. Google may reject product feeds from merchants who fail to update their feeds with the required data. Starting May 3, Google will begin requiring unique identifiers for all products except apparel and one-of-a-kind items. The "unique product identifiers" help Google match products to the correct "product pages,"