We need more requirements. I'd like to submit the following as a starting point:
* Must be usable with respect to the correct chronological context. Consider how the first 10 amendments to the US Constitution have been hashed over, in the last 200+ years. We need to be able to reference the exact version of the language, as used, in any legal script. This will keep lawyers from interpreting version 1.0 laws using version 2.0 rules and definitions. Alternatively, the task is monumental: create a language that will stand as valid speech, *forever.*
* Must be amendable. Amendments to the language must not be permitted to collide with existing definitions. I would go as far as to say that synonyms and homonyms must be strictly prohibited; a side effect here is a relatively pun-free language.
* The definition of anything must be readily quantifiable, without ambiguity, right down to the planck constant if need be. Recommending the strict use of SI measurements for both space and time.
* An improved version of these requirements must be penned in version 1.0 of the language, to be followed immediately by version 2.0