xkb_keymap {
    xkb_keycodes  { include "evdev+aliases(qwerty)" };
    xkb_types     { include "complete"  };
    xkb_compat    { include "complete"  };
    xkb_symbols   { include "pc+us(dvorak)+inet(evdev)+terminate(ctrl_alt_bksp)"    };
    xkb_geometry  { include "pc(pc105)" };
};

default partial alphanumeric_keys modifier_keys
xkb_symbols "basic" {
    include "us(basic)"
    include "/usr/share/X11/xkb/symbols/it"
    include "B(S1)|B(S2)"
    include "%S/de(basic)"
    override "B(S1)|B(S2)"

    name[Group1] = "Banana (US)";
 
    key <AE01> { [ exclam,          1]     };
    key <AE12> { [ plus,            equal] };
    key <A> { [Greek_alpha, Greek_ALPHA, ae, AE] };
    key <AD05> { [t, T, tslash, Tslash] };       // Type: FOUR_LEVEL_ALPHABETIC
    key <AD01> { [], [], [ q, Q ] };
    key <AD05> { [ b, B, U1F966 ]};
    key <> { [NoSymbol, a, b, {a, b}] };

    key <LALT> { virtualModifier = Alt   }; // Alt is bound to <LALT>

    key <LALT> {
        symbols[Group1]=[Alt_L],
        actions[Group1]=[SetMods(modifiers=modMapMods)]

        repeat = False,
        [ Alt_L ]
    };

    key <AD01> {
        type[Group1] = "TWO_LEVEL", // Type
        [q, Q]                      // Symbols
    };

    key <LCTL> {
        symbols[1] = [ Control_L                                          ],
        actions[1] = [ { SetMods(modifiers=Control), SetGroup(group=+1) } ]
    };

    override key <AC11> {[ agrave,      adiaeresis,     braceleft       ]};
    replace key <PRSC> {[  Super_R,  Super_R  ]};
    modifier_map Mod4 { <PRSC>, <RWIN> };
    modifier_map Mod1 { <LALT>,<RALT> };
};
 
// Mandatory to extend the
! include %S/evdev
 
! option     = symbols
  custom:foo = +custom(bar)
  custom:baz = +other(baz)

// Explicit default section with no name required
partial alphanumeric_keys
xkb_symbols { include "us(basic)" };

xkb_keycodes "jp106" {
    include "sgi_vndr/indigo(pc101)"
    <VOL-> = 122;
    <HZTG> = 22;
    alias <AE13> = <BKSL>;
    augment "sgi_vndr/indy(pc101)"
    alternate <BKSL> = 100;
    minimum = 8;
    maximum = 255;
};

xkb_types {
    // ...
    type "TWO_LEVEL_PLUS_CONTROL" {
        modifiers = Shift + Control;
        map[None]          = Level1;
        map[Shift]         = Level2;
        map[Control]       = Level3;
        map[Control+Shift] = Level4;
        // Using preserve will make Control not consumed and allow
        // applications to detect keyboard shortcuts with alternative
        // keysyms in levels 3 and 4 rather than the levels 1 and 2.
        preserve[Control]       = Control;
        preserve[Control+Shift] = Control;
        preserve[Shift+Lock+LevelThree] = Lock;
        level_name[Level1] = "Base";
        level_name[Level2] = "Shift";
        level_name[Level3] = "Tweaked Control";
        level_name[Level4] = "Tweaked Control + Shift";
    };
};

default partial xkb_compatibility "basic" {
    interpret AccessX_Enable {
        action = LockControls(controls=AccessXKeys);
    };
};

default xkb_compatibility "basic" {
    virtual_modifiers  NumLock;

    interpret.repeat = False;
    setMods.clearLocks = True;
    latchMods.clearLocks = True;

    interpret Shift_Lock+AnyOf(Shift+Lock) {
        action = LockMods(modifiers=Shift);
    };

    interpret Num_Lock+Any {
        virtualModifier = NumLock;
        action = LockMods(modifiers=NumLock);
    };

    interpret Mode_switch {
        action = SetGroup(group=+1);
    };

    interpret Any + Any {
        action = SetMods(modifiers=modMapMods);
    };

    group 2 = Mod5;

    indicator "Shift Lock" {
        !allowExplicit;
        whichModState = Locked;
        modifiers = Shift;
    };
};