MIL-STD-130N
w/Change 1
APPENDIX A
STRUCTURING DATA ELEMENTS FOR ITEM UNIQUE IDENTIFICATION (IUID)
A.1 SCOPE
A.1.1 Scope. This appendix explains how data elements are linked together using marking protocol semantics to derive a unique item identifier (UII). The purpose is to provide sufficient Data Matrix symbol machine-readable information in an item mark, which includes information from all labels, tags, etc. associated with the item, to derive one and only one UII that is unique and unambiguous for the life of the item. This appendix is not a mandatory part of the standard. The information contained herein is intended for guidance only.
A.2 UII DATA STRUCTURE
A.2.1 UII data set. A UII is derived from specific elements in an item mark's Data Matrix symbol(s) data set that may include not only the applicable UII information but also item source, PIN, and additional information as required by this standard and contract specifications. When selecting an item marking protocol for use, the marking activity is responsible to ensure all of the data elements in the mark are considered when determining the data elements and data qualifiers (i.e., the semantics) for use to ensure the UII is unique for the item. If the mark's Data Matrix symbol(s) MRI data elements could potentially be used to construct different UIIs for the same item, the marking activity is responsible to mitigate the ambiguity by changing either the Data Matrix symbol(s) MRI data set in the mark or the data qualifiers used to identify the UII data set, within the parameters of the protocol selected for the mark. The UII types, limited to 50 characters (A to Z, 0 to 9, hyphen "-", and forward slash "/"), are as follows:
a. Construct #1: UII type where serial number is unique within the enterprise.
b. Construct #2: UII type where serial number is unique within the original part, lot or batch number that is unique within the enterprise.
c. IUID equivalent (see 3.2).
A.2.2 Semantics. For the UII data set elements to be "machine readable" by an AIT device, they are identified by some means such that the AIT device can recognize, through its resident software and the message syntax of the bar code symbol, what data element it is reading. This is accomplished by employing the concept of "semantics", which is literally "the meaning of language". For the purposes of constructing machine-readable data elements, semantics take the form of data qualifiers. These data qualifiers have to define each data element placed on the item. Table VI shows the different data qualifiers for each of the data elements that are used for determining uniqueness of the UII. The data qualifiers indicate to the AIT device or the automated information system whether to derive the UII by using Construct #1 rules, Construct
#2 rules, single data element rules, or a DoD recognized IUID equivalent. Tables A-I, A-II, and A-III respectively show how UIIs are derived from an ordered set of elements identified by Application Identifiers (AI - see 3.2), Data Identifiers (DI - see 3.2), and Text Element Identifiers (TEI - see 3.2).
A.2.3 Business rules for deriving a UII. The following is a subset of the IUID business rules extracted from the Department of Defense Guide to Uniquely Identifying Items for consideration when determining the uniqueness of a UII.
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