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Chapter 11. Tagging and tracing Program Integrated Information 187important role for the ID tag. We will explain the architecture of this prefix moreprecisely in this section. The prefix J7d signifies Japanese, Release 17, d build forthis ID tag. Here is the complete format of an ID tag:(PrefixFilenumber.Linenumber)Here are the semantics of the elements:“(”: Start of the ID tag“)”: End of the ID tag“Prefix”: Prefix“Filenumber”: The file number of the PII file that includes the string. The filenumber is assigned within each language directory.“.”: Separator between the file number and the line numberThe parentheses not only separate the ID tag from the PII strings, but also makeit possible to recognise concatenated PII strings in the GUI. We will explain the“Prefix” more fully in the next section. To keep the ID tags short, we did not insertany character to separate the “Prefix” from “Filenumber”. We used decimalnumbers for the file numbers (Filenumber) and the line numbers (Linenumber).The average length of the PII file names for CATIA is 28 characters and the averagekey length for CATIA is 34 characters. The GUI elements often do not have spacefor very long names for the PII strings. The length of an ID tag needs to be shortto limit the space that it occupies in the GUI. We considered using hexadecimalnumbers to shorten the length of the ID tags. The hex numbers would reduce thelength when the file numbers are large. However, this called for a separator betweenthe prefix and the file number and actually increased the average length ofthe ID tag. The readability of the ID tag was also greatly decreased as hexadecimal.Therefore, we used ordinary decimal numbers.We prepared the comprehensive index files to help the TVT testers find specificPII keys in the PII files with or without ID tags. The format of the ID tag allowsa TVT tester to search for the location of the ID in the comprehensive index file.The comprehensive index file uses a plain text format, and it is a list of all of thePII for both the original and target languages. We will describe the comprehensiveindex file more fully in Section 5.5.5.3 Prefix architecture of ID TagsA TVT tester can assign any ASCII strings to the prefixes when an ID tag is used inTVT. However, the TVT tester must conform to the prefix architecture. The prefixarchitecture is an important feature of the ID tag. Without it, the value of the IDtags would be reduced.