Conventions

[Arta]

Incomplete how?

[Hdx]

A word is the standard unit on a machine.  A word on a 16-bit machine is 2 bytes, on a 32-bit machine it's 4 bytes, and on a 64-bit machine it's 8 bytes.

We only get the bolded parts:

WORD     A 16-bit unsigned little-endian integer.

It tells nothing about the type of machine affecting it's size.
~-~(HDX)~-~

[MyndFyre]

It tells nothing about the type of machine affecting it's size.

Like I said, though, it depends on whom you ask.  My college prof would have told you that a word is 16 bits, period.  Interestingly, in 32-bit MASM, a WORD is still a 16-bit integer:
http://crystal.uta.edu/~vasudeva/teaching/cse2312_summer05/lectures/lecture7/notes.html#L9_B31.
I have to wonder that if a WORD wasn't a 16-bit value, how would an assembler define a 16-bit value?  The mneumonic is "dw", for "define word".  To define a 32-bit value, it's "dd", for "define doubleword".  Etcetera.
Other links:
http://cs.wwc.edu/~aabyan/Unix/x86.html (do a search for "dw" to find it).
http://www.cs.uwc.ac.za/~iventer/Courses/cos365/AssemblyTheory/Assem40Lang.htm

[LivedKrad]

It sounds to me like all of this can be solved by allowing preference.

[R.a.B.B.i.T]

Anyways, Kp backs me up unwittingly, but yes, I say go with XML so people can have what they want