EPCTM Generation 1 Tag Data Standards Version 1.1 Rev.1.27 Standard Specification 10 May 2005

描述：This document defines the EPC Tag Data Standards version 1.1. These standards define 39 completely that portion of EPC tag data that is standardized, including how that data is 40 encoded on the EPC tag itself (i.e. the EPC Tag Encodings), as well as how it is encoded 41 for use in the information systems layers of the EPC Systems Network (i.e. the EPC URI 42 or Uniform Resource Identifier Encodings). Readers should be advised that this Tag 43 Data Specification Version 1.1 only applies to tag types in common use at the time of its 44 publication. In particular, it does not provide specific guidance for using UHF Class 1 45 Generation 2 tags ("Gen 2 tags"). It is intended that future Tag Data Specification will 46 add guidance for use of Gen 2 tags, along with any substantive changes to the Tag Data 47 Specification needed to support aspects of Gen 2 tags that differ from earlier tag types. 48 49 The EPC Tag Encodings include a Header field followed by one or more Value Fields. 50 The Header field defines the overall length and format of the Values Fields. The Value 51 Fields contain a unique EPC Identifier and optional Filter Value when the latter is judged 52 to be important to encode on the tag itself. 53 The EPC URI Encodings provide the means for applications software to process EPC 54 Tag Encodings either literally (i.e. at the bit level) or at various levels of semantic 55 abstraction that is independent of the tag variations. This document defines four 56 categories of URI: 57 1. URIs for pure identities, sometimes called “canonical forms.” These contain only 58 the unique information that identifies a specific physical object, and are 59 independent of tag encodings. 60 2. URIs that represent specific tag encodings. These are used in software 61 applications where the encoding scheme is relevant, as when commanding 62 software to write a tag. 63 3. URIs that represent patterns, or sets of EPCs. These are used when instructing 64 software how to filter tag data. 65 4. URIs that represent raw tag information, generally used only for error reporting 66 purposes
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