A comma separated list of variants, one per layout, which may
modify or augment the respective layout in various ways.
If NULL or the empty string "", and a default value is also used
for the layout, a default value is used. Otherwise no variant is
used.
If the XKB_DEFAULT_VARIANT environment variable is set, it is used
as the default. Otherwise the system default is used.
A comma separated list of variants, one per layout, which may modify or augment the respective layout in various ways.
If NULL or the empty string "", and a default value is also used for the layout, a default value is used. Otherwise no variant is used. If the XKB_DEFAULT_VARIANT environment variable is set, it is used as the default. Otherwise the system default is used.