描述：This document defines the EPC Tag Data Standards version 1.4. It applies to RFID tags conforming to “EPC Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Protocol for Communications at 860 MHz-960MHz Version 1.1.0” (“Gen2 Specification”). Such tags will be referred to as “Gen 2 Tags” in the remainder of this document. These standards define completely that portion of EPC tag data that is standardized, including how that data is encoded on the EPC tag itself (i.e. the EPC Tag Encodings), as well as how it is encoded for use in the information systems layers of the EPC Systems Network (i.e. the EPC URI or Uniform Resource Identifier Encodings). The EPC Tag Encodings include a Header field followed by one or more Value Fields. The Header field defines the overall length and format of the Values Fields. The Value Fields contain a unique EPC Identifier and a required Filter Value when the latter is judged to be important to encode on the tag itself. The EPC URI Encodings provide the means for applications software to process EPC Tag Encodings either literally (i.e. at the bit level) or at various levels of semantic abstraction that is independent of the tag variations. This document defines four categories of URI: 1. URIs for pure identities sometimes called “canonical forms.” These contain only the unique information that identifies a specific physical object, location or organization, and are independent of tag encodings. 2. URIs that represent specific tag encodings. These are used in software applications where the encoding scheme is relevant, as when commanding software to write a tag. 3. URIs that represent patterns, or sets of EPCs. These are used when instructing software how to filter tag data. 4. URIs that represent raw tag information, generally used only for error reporting purposes.
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