partial alphanumeric_keys
xkb_symbols "my-sym" {
    include "us(basic)"
    include "inet(evdev)"
    name[Group1] = "English (US) with modified right side keys";

    key <RALT> {[ Return ], type[group1] = "ONE_LEVEL" };
    key <RCTL> {[ Escape ], type[group1] = "ONE_LEVEL" };
    key <DEL> { [ F13, Delete ], type[group1] = "TWO_LEVEL" };
    key <INS> { [ F14, Insert ], type[group1] = "TWO_LEVEL" };
    key <ESC> {[ F15 ]};
    key <RET> {[ Control_R ], type[group1] = "ONE_LEVEL" };

    replace key <CAPS> {[ Control_L ], type[group1] = "ONE_LEVEL" };
    replace key <LCTL> {[ Caps_Lock ]};
    modifier_map Control { <CAPS> };
    modifier_map Lock { <LCTL> };
};