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--- abstract syntax of a query language
-
-abstract Base = {
-
-cat
- S ;
- NP ;
- PN ;
- CN ;
- AP ;
- A2 ;
- Conj ;
-fun
-
--- sentence syntax
- PredAP : NP -> AP -> S ;
-
- ComplA2 : A2 -> NP -> AP ;
-
- ModCN : AP -> CN -> CN ;
-
- ConjAP : Conj -> AP -> AP -> AP ;
- ConjNP : Conj -> NP -> NP -> NP ;
-
- UsePN : PN -> NP ;
- Every : CN -> NP ;
- Some : CN -> NP ;
-
- And, Or : Conj ;
-
--- lexicon
-
- UseInt : Int -> PN ;
-
- Number : CN ;
- Even, Odd, Prime : AP ;
- Equal, Greater, Smaller, Divisible : A2 ;
-
- Sum, Product, GCD : ListPN -> PN ;
-
--- adding questions
-
-cat
- Question ;
- Answer ;
- ListPN ;
-fun
- WhatIs : PN -> Question ;
- WhichAre : CN -> AP -> Question ;
- QuestS : S -> Question ;
-
- Yes : Answer ;
- No : Answer ;
- Value : NP -> Answer ;
-
- None : NP ;
- Many : ListPN -> NP ;
- BasePN : PN -> PN -> ListPN ;
- ConsPN : PN -> ListPN -> ListPN ;
-}