GS1 EPC Tag Data Standard 1.6 - Indicod-Ecr

418441854186418741884189419041914192419341944195419641974198419942004201420242034204420542064207420842094210within a Packed Object by an ID Value, representing an index denoting an entry in aregistered Base Table of ID Values. A single ID Value may represent a single ObjectIdentifier, or may represent a commonly-used sequence of Object Identifiers. In somecases, the ID Value represents a “class” of related Object Identifiers, or an ObjectIdentifier sequence in which one or more Object Identifiers are optionally encoded; inthese cases, Secondary ID Bits (see I.6) are encoded in order to specify which selectionor option was chosen when the Packed Object was encoded. A “fully-qualified IDValue” (FQIDV) is an ID Value, plus a particular choice of associated Secondary ID bits(if any are invoked by the ID Value’s table entry). Only one instance of a particularfully-qualified ID Value may appear in a data carrier’s Data Packed Objects, but aparticular ID Value may appear more than once, if each time it is “qualified” by differentSecondary ID Bits. If an ID Value does appear more than once, all occurrences shall bein a single Packed Object (or within a single “chain” of a Packed Object plus itsAddenda).There are two methods defined for encoding ID Values: an ID List Packed Object uses avariable-length list of ID Value bit fields, whereas an ID Map Packed Object uses afixed-length bit array. Unless a Packed Object’s format is modified by an initial FormatFlags pattern, the Packed Object’s format defaults to that of an ID List Packed Object(IDLPO), containing a single ID List, whose ID Values correspond to the default Base IDTable of the registered Data Format. Optional Format Flags can change the format of theID Section to either an IDMPO format, or to an IDLPO format encoding an ID Listssection (which supports multiple ID Tables, including non-default data systems).Although the ordering of information within the Object Info section varies with thechosen format (see I.5.1), the Object Info section of every Packed Object shall provideLength information as defined in I.5.2, and ID Values information (see I.5.3) as definedin I.5.4, or I.5.5. The Object Info section (of either an IDLPO or an IDMPO) mayconclude with an optional Addendum subsection (see I.5.6).4211I.5.1Object Info formats4212421342144215421642174218I.5.1.1 IDLPO default Object Info formatThe default IDLPO Object Info format is used for a Packed Object either without aleading Format Flags section, or with a Format Flags section indicating an IDLPO with apossible Addendum and a default Object Info section. The default IDLPO Object Infosection contains a single ID List (optionally followed by an Addendum subsection if soindicated by the Format Flags). The format of the default IDLPO Object Info section isshown in Table I 5-1.Copyright ©2005- 2011 GS1 AISBL, All Rights Reserved. Page 170 of 218