default alphanumeric_keys
xkb_symbols "garbage" {
    include "us"

    name[Group1]= "My garbage Layout";

    // The garbage keysym will *not* override the corresponding symbol from the
    // 'us' layout
    key <TLDE> { [ keysym_is_garbage, exclam ] };

    // AE13 is unused by 'us', use it to avoid fallback to the 'us' definition.
    // Define with 2 levels but first level is a garbage symbol.
    key <AE13> { [ keysym_is_garbage, asciitilde ] };
};
