XML Configuration for Karabiner to enable iOS-like Caps Lock by double-tapping Shift key

private.xml

<?xml version="1.0"?>
<root>

  <item>
    <name>Change shift key x2 to caps lock.</name>
    <identifier>private.shift_x2_to_capslock</identifier>

    <block>
      <modifier_only>ModifierFlag::CAPSLOCK</modifier_only>
      <autogen>
        __KeyOverlaidModifier__
        KeyCode::SHIFT_L,
        KeyCode::SHIFT_L,
        KeyCode::CAPSLOCK,
      </autogen>
      <autogen>
        __KeyOverlaidModifier__
        KeyCode::SHIFT_R,
        KeyCode::SHIFT_R,
        KeyCode::CAPSLOCK,
      </autogen>
    </block>

    <autogen>
      __DoublePressModifier__
      KeyCode::SHIFT_L,
      KeyCode::SHIFT_L,
      KeyCode::CAPSLOCK,
    </autogen>
    <autogen>
      __DoublePressModifier__
      KeyCode::SHIFT_R,
      KeyCode::SHIFT_R,
      KeyCode::CAPSLOCK,
    </autogen>
  </item>

</root>