On 15 Apr 2016 15:00, Chris Leonard wrote:
> They do not appear to be usefully populated with data at present.
> 
> +1 for dropping current entries, but I'd like to know more about the
> intended use of these fields.

ISO 30112 WD10 [2014] says:

audience
	If not for general use, an indication of the intended user
	audience. This keyword is optional.

application
	If for use of a special application, a description of the
	application. This keyword is optional.

abbreviation
	Short name for provider of the source. This keyword is
	optional.

i'm not sure any of these would really be usefully set in glibc.
-mike