| http://www.w3.org/ns/prov#value | - CROSS-REFERENCETO RELATED APPLICATION This application claims the priority of Chinese Patent Application No. 200820171355.7 filed Dec. 16, 2008, under 35 U.S.C. .sctn.119, the disclosure of which is hereby expressly incorporated by reference.BACKGROUND In their daily lives, people often use bags such as paper or plastic bags, cloth bags and so on, for example, for shopping.
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