描述：This document defines the EPC Tag Data Standards version 1.3. It applies to RFID tags 36 conforming to “EPC Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID 37 Protocol for Communications at 860 MHz-960MHz Version 1.0.9” (“Gen2 Specification”). 38 Such tags will be referred to as “Gen 2 Tags” in the remainder of this document. These 39 standards define completely that portion of EPC tag data that is standardized, including how 40 that data is encoded on the EPC tag itself (i.e. the EPC Tag Encodings), as well as how it is 41 encoded for use in the information systems layers of the EPC Systems Network (i.e. the EPC 42 URI or Uniform Resource Identifier Encodings). 43 44 The EPC Tag Encodings include a Header field followed by one or more Value Fields. The 45 Header field defines the overall length and format of the Values Fields. The Value Fields 46 contain a unique EPC Identifier and a required Filter Value when the latter is judged to be 47 important to encode on the tag itself. 48 The EPC URI Encodings provide the means for applications software to process EPC Tag 49 Encodings either literally (i.e. at the bit level) or at various levels of semantic abstraction that 50 is independent of the tag variations. This document defines four categories of URI: 51 1. URIs for pure identities, sometimes called “canonical forms.” These contain only the 52 unique information that identifies a specific physical object, location or organization, 53 and are independent of tag encodings. 54 2. URIs that represent specific tag encodings. These are used in software applications 55 where the encoding scheme is relevant, as when commanding software to write a tag. 56 3. URIs that represent patterns, or sets of EPCs. These are used when instructing 57 software how to filter tag data. 58 4. URIs that represent raw tag information, generally used only for error reporting 59 purposes.
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