If you are using a layout for 105 keys on a keyboard with only 104 keys, there is one key missing.
The missing key is the key between left-shift and the z-key. The key is named lsgt_switch. This key generates the less and greater sign.
For example if I am using layout de (setxkbmap de) on a US-keyboard, I am not able to get a less or greater sign.
So it would be good if I can get it over the compose key.