Comment 25 for bug 181595

I recommend adding the bar (007C) to Shift+AltGr+L (level 4).

I see no reason for adding the broken bar. Just because it is on some other keyboard is not a valid reason. There are several characters and symbols which would be much more useful, and which are not added. Users should use the combinations specified in the compose file if they need those rare characters, or some application specific solution (e.g. layout programs, math programs have their own solutions for specific symbols).

Here are my recommendations:

Add < to level 4 of AE08 (8).
Add > to level 4 of AE09 (9).
Add | (007C, vertical bar) to level 4 of AC09 (L).

I.e.
key <AE08> { [ 8, parenleft, bracketleft, less ] };
key <AE09> { [ 9, parenright, bracketright, greater ] };
key <AC09> { [ l, L, dead_stroke, bar ] };