JEITA  CP-3451 - 29 - Table 7    Implementation of Defined and Undefined Character Codes ID Code Exif Reader Implementation Defined   (JIS, ASCII, etc.) Determines the ID code and displays it in accord with the reader capability.   Undefined (all NULL) Depends  on  the  localized  PC  in  each  country.  (If  a  character  code  is  used  for which there is no clear specification like Shift-JIS in Japan, Undefined is used.)   Although   the   possibility   of   unreadable   characters   exists,   display   of   these characters is left as a matter of reader implementation.   When a UserComment area is set aside, it is recommended that the ID code be ASCII and that the following user comment part be filled with blank characters [20.H].   E.    Tag Relating to Related File RelatedSoundFile This  tag  is  used  to  record  the  name  of  an  audio  file  related  to  the  image  data.  The  only  relational  information recorded  here  is  the  Exif  audio  file  name  and  extension  (an  ASCII  string  consisting  of  8  characters  +  '.'  +  3 characters). The path is not recorded. Stipulations on  audio are given in section 0. File naming conventions are given in section 0. When using this tag, audio files shall be recorded in conformance to the Exif audio format. Writers are also allowed to store the data such as Audio within APP2 as Flashpix extension stream data. Audio files shall be recorded in conformance to the Exif audio format. The mapping of Exif image files and audio files is done in any of the three ways shown in Table 8. If multiple files are mapped to one file as in [2] or [3] of this table, the above format is used to record just one audio file name. If there are multiple audio files, the first recorded file is given. In the case of [3] in Table 8, for example, for the Exif image file "DSC00001.JPG" only "SND00001.WAV" is given as the related Exif audio file. When there are three Exif audio files "SND00001.WAV", "SND00002.WAV" and "SND00003.WAV", the Exif image file name for each of them, "DSC00001.JPG," is indicated. By combining multiple relational information, a variety of playback possibilities can be supported. The method of using relational information is left to the implementation on the playback side. Since this information is an ASCII character string, it is terminated by NULL.   Table 8 Mapping between Image and Audio Files Relationship Exif Image File Exif Audio File [1] 1 to 1 DSC00001.JPG   SND00001.WAV   [2] Plural to 1 DSC00001.JPG   DSC00002.JPG   DSC00003.JPG   SND00001.WAV   [3] 1 to plural DSC00001.JPG   SND00001.WAV   SND00002.WAV   SND00003.WAV