Description of problem:
From https://bugs.freedesktop.org/show_bug.cgi?id=66345

XKB key names are limited to four octets.  Initially I didn't know that,
and tried to use longer names, like this:

$ cat t0.xkb
xkb_keymap {
xkb_keycodes "test_keycodes" {
        minimum = 8;
        maximum = 255;
        <FOOBAR> = 10;
};
xkb_types "complete" { include "complete" };
xkb_compatibility "complete" { include "complete" };
xkb_symbols "us" { include "us" };
xkb_geometry "kinesis" { include "kinesis" };
};
$ xkbcomp t0.xkb t0.xkm
syntax error: line 5 of t0.xkb
last scanned symbol is: FOOBARm
Errors encountered in t0.xkb; not compiled.


Version-Release number of selected component (if applicable):
xorg-x11-xkb-utils-7.7-7.el7