irxevent and keysyms

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I have recently switched from native lirc support in mythtv to using 
irxevent so that I can use lirc modes more consistently with other 
programs (native myth doesn't appear to support using a mode with lirc).

In converting I used the keysyms defined in my 
/usr/share/doc/lirc/irxevent.keys to map the keyboard keystrokes with 
the symbol passed to irxevent. There are a couple of keysyms that don't 
map correctly, and I can't figure out why.

My mute button is mapped to "bar", but is output by irxevent as "\". My 
forward button is mapped to "greater" but is output by irxevent as ".". 
It's interesting that "less" is correctly mapped to "<", so my rewind 
button works fine.

begin
  prog = irxevent
  button = Mute
  config = Key bar CurrentWindow
end

begin
  prog = irxevent
  button = Rewind
  repeat = 3
  config = Key less CurrentWindow
end

begin
  prog = irxevent
  button = Forward
  repeat = 3
  config = Key greater CurrentWindow
end

Can anyone explain this behaviour? I'm using lirc 0.8.1+cvs20070310 on 
ubuntu feisty.

Thanks!