The top-level disambiguation grammar. The parser uses this to parse input that might be an answer to a disambiguation prompt ("Which did you mean...?").

We accept whole noun phrases and various fragments of noun phrases in response to these questions. We accept fragments because (a) users are accustomed from lots of other IF games to being able to respond with a word or two, and (b) all we need is something that distinguishes one object from another.

This should use DisambigProduction as the base class for the match tree item.

[Required]

grammar mainDisambigPhrase(main) :   DisambigProduction