The speci?¬?cation de?¬?nes four categories of URI:
. URIs for pure identities, which contain only the unique information that identi?¬?es
a speci?¬?c physical object, location, or organization, and are independent of tag
encodings
. URIs that represent speci?¬?c tag encodings, which are used in software applications
where the encoding scheme is relevant
. URIs that represent patterns or sets of EPCs are used when instructing software
how to ?¬?lter tag data
. URIs that represent raw tag information are generally used only for error reporting
purposes
In V1.3, the speci?¬?c coding schemes include:
. 196 bit General Identi?¬?er (GID)
. Serialized version of the GS1 Global Trade Item Number (GTIN)
. GS1 Serial Shipping Container Code (SSCC)
. GS1 Global Location Number (GLN)
. GS1 Global Returnable Asset Identi?¬?er (GRAI)
. GS1 Global Individual Asset Identi?¬?er (GIAI)
. The DoD Construct
The speci?¬?cation details levels of identity:
. Pure identity level: Pure identity is the identity associated with a speci?¬?c physical or
logical entity and is independent of the identity carrier (RF tag, bar code, or
database ?¬?eld), and takes the form of a URI (a character string). For the EPC
General Identi?¬?er, the pure identity URI representation is urn:epc:id:gid:General-
ManagerNumber.ObjectClass.SerialNumber
. Encoding identity level: The encoding identity is achieved by encoding a pure
identity together with additional information such as ?¬?lter value into a speci?¬?c
syntax, which again is independent of the identity carrier.
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