# Help me map Vorbis to ID3v2 **URL:** \ **Category:** Support\ **Created:** [July 19, 2012, 10:36pm UTC](https://community.mp3tag.de/t/help-me-map-vorbis-to-id3v2/13664 "2012-07-19T22:36:20Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![JJ\_Johnson](https://community.mp3tag.de/user_avatar/community.mp3tag.de/jj_johnson/32/67_2.png) [@JJ\_Johnson](https://community.mp3tag.de/u/JJ_Johnson)\ **Post date:** [July 20, 2012, 3:44am UTC](https://community.mp3tag.de/t/help-me-map-vorbis-to-id3v2/13664/5 "2012-07-20T03:44:17Z")
> [@aax](#): > > Yes. I used that as a starting point for setting up Tag Panel and for my table above. It doesn't list Vorbis mappings because they are not standardised. > And I was talking about ID3 catalog number tag ID3v2 has special [TXXX](http://www.id3.org/id3v2.3.0#head-29e37534e169ad913deb6a4fee345028f3db7c3f) (user defined) fields, which allow you to have fields of any name. In Mp3tag, if a name doesn't map to one of its recognized four-letter frame names, then Mp3tag will create a TXXX frame with that description. So you _can_ write things like 'Catalog #' or "Catalog Number'. This is commonly how ReplayGain fields are written to ID3v2 tags - TXXX frames with descriptions of REPLAYGAIN\_TRACK\_GAIN, REPLAYGAIN\_ALBUM\_GAIN, etc.. You can read the ID3v2.3 and 2.4 specs [here](http://www.id3.org/Developer_Information), but they've been extended quite a bit with de facto standards by applications, mostly iTunes. There's no mention of a frame to store catalog numbers. Googling around a bit, I can't find anything suggesting a de facto standard, either. It seems that most often it's written into the comment (COMM) field. --- _[View the full topic](https://community.mp3tag.de/t/help-me-map-vorbis-to-id3v2/13664)._