ONIX Code Lists Issue 63, October 2023

List 24: Extent unit

Value Description Notes
00 Physical pieces Unbound sheets or leaves, where ‘pages’ is not appropriate, for example a count of the individual number of cards in a pack. Only for use in ONIX 3.0 or later. For number of pieces in eg a jigsaw, kit, board game, see <ProductFormFeature> and code 22 from list 79
01 Characters Approximate number of characters (including spaces) of natural language text. Only for use in ONIX 3.0 or later
02 Words Approximate number of words of natural language text
03 Pages
04 Hours (integer and decimals)
05 Minutes (integer and decimals)
06 Seconds (integer only)
11 Tracks Of an audiobook on CD (or a similarly divided selection of audio files). Conventionally, each track is 3–6 minutes of running time, and track counts are misleading and inappropriate if the average track duration is significantly more or less than this. Note that track breaks are not necessarily aligned with structural breaks in the text (eg chapter breaks)
12 Discs Of an audiobook on multiple Red Book audio CDs. Conventionally, each disc is 60–70 minutes of running time, and disc counts are misleading and inappropriate if the average disc duration is significantly more or less than this (for example if the discs are Yellow Book CDs containing mp3 files). Note that disc breaks are not necessarily aligned with structural breaks in the text (eg chapter breaks). Only for use in ONIX 3.0 or later
14 Hours HHH Fill with leading zeroes if any elements are missing
15 Hours and minutes HHHMM Fill with leading zeroes if any elements are missing
16 Hours minutes seconds HHHMMSS Fill with leading zeroes if any elements are missing. If centisecond precision is required, use HHHMMSScc. Only for use in ONIX 3.0 or later
17 Bytes
18 Kbytes
19 Mbytes