描述：The EPC Tag Data Standard defines the Electronic Product Code?, and also specifies 392 the memory contents of Gen 2 RFID Tags. In more detail, the Tag Data Standard covers 393 two broad areas: 394 ? The specification of the Electronic Product Code, including its representation at 395 various levels of the EPCglobal Architecture and its correspondence to GS1 keys and 396 other existing codes. 397 ? The specification of data that is carried on Gen 2 RFID tags, including the EPC, “user 398 memory” data, control information, and tag manufacture information. 399 The Electronic Product Code is a universal identifier for any physical object. It is used in 400 information systems that need to track or otherwise refer to physical objects. A very 401 large subset of applications that use the Electronic Product Code also rely upon RFID 402 Tags as a data carrier. For this reason, a large part of the Tag Data Standard is concerned 403 with the encoding of Electronic Product Codes onto RFID tags, along with defining the 404 standards for other data apart from the EPC that may be stored on a Gen 2 RFID tag. 405 Therefore, the two broad areas covered by the Tag Data Standard (the EPC and RFID) 406 overlap in the parts where the encoding of the EPC onto RFID tags is discussed. 407 Nevertheless, it should always be remembered that the EPC and RFID are not at all 408 synonymous: EPC is an identifier, and RFID is a data carrier. RFID tags contain other 409 data besides EPC identifiers (and in some applications may not carry an EPC identifier at 410 all), and the EPC identifier exists in non-RFID contexts (those non-RFID contexts 411 including the URI form used within information systems, printed human-readable EPC 412 URIs, and EPC identifiers derived from bar code data following the procedures in this 413 standard)
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