描述：The EPC Tag Data Standard defines the Electronic Product Code?, and also specifies 37 the memory contents of Gen 2 RFID Tags. In more detail, the Tag Data Standard covers 38 two broad areas: 39 ? The specification of the Electronic Product Code, including its representation at 40 various levels of the EPCglobal Architecture and it correspondence to GS1 keys and 41 other existing codes. 42 ? The specification of data that is carried on Gen 2 RFID tags, including the EPC, “user 43 memory” data, control information, and tag manufacture information. 44 The Electronic Product Code is a universal identifier for any physical object. It is used in 45 information systems that need to track or otherwise refer to physical objects. A very 46 large subset of applications that use the Electronic Product Code also rely upon RFID 47 Tags as a data carrier. For this reason, a large part of the Tag Data Standard is concerned 48 with the encoding of Electronic Product Codes onto RFID tags, along with defining the 49 standards for other data apart from the EPC that may be stored on a Gen 2 RFID tag. 50 Therefore, the two broad areas covered by the Tag Data Standard (the EPC and RFID) 51 overlap in the parts where the encoding of the EPC onto RFID tags is discussed. 52 Nevertheless, it should always be remembered that the EPC and RFID are not at all 53 synonymous: EPC is an identifier, and RFID is a data carrier. RFID tags contain other 54 data besides EPC identifiers (and in some applications may not carry an EPC identifier at 55 all), and the EPC identifier exists in non-RFID contexts (those non-RFID contexts 56 including the URI form used within information systems, printed human-readable EPC 57 URIs, and EPC identifiers derived from bar code data following the procedures in this 58 standard)
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