travel.fcfg

% start USR


# IBIS / domain-independent

USR[sem=?s] -> ANSWER[sem=?s] | ASK[sem=?s]

ASK[sem=[Ask=?q]] -> WHQ[q=?q]

ANSWER[sem=[Answer=?ans]] -> SHORTANS[ans=?ans] | YESNOANS[ans=?ans]

SHORTANS[ans=?ind] -> CAT[cat=?cat, ind=?ind]
#SHORTANS[ans=[pred=?cat, ind=?ind]] -> CAT[cat=?cat, ind=?ind]

YESNOANS[ans=yes] -> 'yes' | 'yeah'
YESNOANS[ans=yes] -> 'no' | 'nope'


# travel

WHQ[q=price] -> 'price'

CAT[cat=how, ind=plane] -> 'plane' | 'flight'
CAT[cat=how, ind=train] -> 'train'

CAT[cat=city, ind=london] -> 'london'
CAT[cat=city, ind=paris]  -> 'paris'
CAT[cat=city, ind=berlin] -> 'berlin'

CAT[cat=class, ind=first]  -> 'first' | 'business'
CAT[cat=class, ind=second] -> 'second' | 'economy'

CAT[cat=day, ind=today]    -> 'today'
CAT[cat=day, ind=tomorrow] -> 'tomorrow'