Branch :
xkb_compat "new" {
virtual_modifiers U7, Z7=0, M7=0x70000;
augment virtual_modifiers U1, U2=none, U3=0x300000;
override virtual_modifiers U4, U5=none, U6=0x600000;
augment virtual_modifiers Z1, Z2=none, Z3=0x310000;
override virtual_modifiers Z4, Z5=none, Z6=0x610000;
augment virtual_modifiers M1, M2=none, M3=0x320000;
override virtual_modifiers M4, M5=none, M6=0x620000;
};