And those of us who work with protocol definitions every day can be immensely frustrated that this document seeks to be the definition of a protocol ... but never actually defines it!
If you try to teach something by example that's fair enough, provided you can pull the real definition off the shelf to resolve any issues, but you can't define a protocol by example.
If you think that's bad, try the standard phrases in CAP493 App E. The sad thing is, it really does matter how these things are used and interpreted, and no one seems to have come up with an unambiguous reference.