An APE tag item key is a key for accessing special meta-information in an audio file.
Member of APE Tag Item.
APE tag item keys can have a length of 2 (including) up to 255 (including) characters in the range from 0x20 (Space) until 0x7E (Tilde).
Typical keys should have a length of 2 ... 16 characters using the following characters:
Space (0x20), Slash (0x2F), Digits (0x30...0x39), Letters (0x41...0x5A, 0x61...0x7A).
Values can contain binary data, a value or a list of values. See here.
List of values can be mixed, i.e. contain UTF-8 strings and external references
beginning with file://..., http://www..., ftp://ftp....
Not allowed are the following keys: ID3, TAG, OggS and MP+.
Currently the following keys are defined:
Recommended format of value
Music Piece Title
|Subtitle||Title when TITLE contains the work or additional sub title||UTF-8 string|
|Album||Album name||UTF-8 string|
|Debut album||Debut album name||UTF-8 string|
|Publisher||Record label or publisher||UTF-8 string|
Name of the original composer