{-

Module : $Header$

Copyright : (c) Klaus L�ttich, Uni Bremen 2002-2004

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : hets@tzi.de

Stability : provisional

Portability : portable

Coding out subsorting into unary predicates.

New concept for proving Ontologies.

-}

{-

todo:

-}

module Comorphisms.CASL2TopSort where

import Control.Exception (assert)

-- import Debug.Trace (trace)

import Maybe

import Data.List

import Logic.Logic

import Logic.Comorphism

import Common.Id

import Common.Result

import qualified Common.Lib.Map as Map

import qualified Common.Lib.Set as Set

import qualified Common.Lib.Rel as Rel

import Common.AS_Annotation

-- CASL

import CASL.Logic_CASL

import CASL.AS_Basic_CASL

import CASL.Sign

import CASL.Morphism

import CASL.Sublogic

import CASL.Utils

import CASL.Overload (injName)

-- | The identity of the comorphism

data CASL2TopSort = CASL2TopSort deriving (Show)

instance Language CASL2TopSort -- default definition is okay

instance Comorphism CASL2TopSort

CASL CASL_Sublogics

CASLBasicSpec CASLFORMULA SYMB_ITEMS SYMB_MAP_ITEMS

CASLSign

CASLMor

Symbol RawSymbol ()

CASL CASL_Sublogics

CASLBasicSpec CASLFORMULA SYMB_ITEMS SYMB_MAP_ITEMS

CASLSign

CASLMor

Symbol RawSymbol () where

sourceLogic CASL2TopSort = CASL

sourceSublogic CASL2TopSort = CASL_SL

{ has_sub = True,

has_part = True,

has_cons = True,

has_eq = True,

has_pred = True,

which_logic = FOL

}

targetLogic CASL2TopSort = CASL

targetSublogic CASL2TopSort = CASL_SL

{ has_sub = False, -- subsorting is coded out

has_part = True,

has_cons = True,

has_eq = True,

has_pred = True,

which_logic = FOL

}

mapSublogic CASL2TopSort sub =

sublogics_max (sublogics_max need_horn need_pred) sub

{ has_sub = False } -- subsorting is coded out

map_theory CASL2TopSort = mkTheoryMapping transSig transSen

map_morphism CASL2TopSort mor =

let rsigSour = trSig $ msource mor

rsigTarg = trSig $ mtarget mor

in case rsigSour of

Result diags1 mrs ->

case rsigTarg of

Result diags2 mrt

| isJust mrs && isJust mrt ->

Result (diags1++diags2) (Just

(mor { msource = fromJust mrs

, mtarget = fromJust mrt }))

| otherwise ->

(Result (diags1++diags2) Nothing)

where trSig sig = case transSig sig of

Result dias mr ->

Result dias (maybe Nothing

(Just . fst)

mr)

map_sentence CASL2TopSort = transSen

map_symbol CASL2TopSort = Set.single . id

data PredInfo = PredInfo { topSort_PI :: SORT

, directSuperSorts_PI :: Set.Set SORT

, predicate_PI :: PRED_NAME

} deriving (Show,Ord,Eq)

type SubSortMap = Map.Map SORT PredInfo

generateSubSortMap :: Set.Set SORT -> Rel.Rel SORT

-> Map.Map Id (Set.Set PredType)

-> Result SubSortMap

generateSubSortMap sorSet sortRels pMap =

let disAmbMap m = Map.map disAmbPred m

disAmbPred v = if (predicate_PI v) `Map.member` pMap

then disAmbPred' (1::Int) v'

else v

where v' = add "_s" v

disAmbPred' x v1 =

if (predicate_PI v1) `Map.member` pMap

then disAmbPred' (x+1) (add (show x) v')

else v1

add s v1 = v1 {predicate_PI =

case predicate_PI v1 of

Id ts is ps ->

assert (not $ null ts) $

Id (init ts ++

[(last ts) {tokStr =

tokStr (last ts)++s}

]) is ps

}

mR = Rel.mostRight sortRels

toPredInfo k e =

let ts = case Set.filter (\pts -> Rel.member k pts sortRels) mR of

s | Set.size s == 1 ->

head $ Set.toList s

| otherwise ->

error ("Something went wrong with: "++

show k++';':show e++';':show s)

in PredInfo { topSort_PI = ts

, directSuperSorts_PI = e Set.\\ mR

, predicate_PI = k }

initMap = Map.filterWithKey (\k _ -> not (Set.member k mR))

(Map.mapWithKey toPredInfo

(Rel.toMap (Rel.intransKernel sortRels)))

in -- trace ("\nnew initMap: "++show initMap) $

return (disAmbMap initMap)

-- | Finds Top-sort(s) and transforms for each top-sort all subsorts

-- into unary predicates. All predicates typed with subsorts are now

-- typed with the top-sort and axioms reflecting the typing are

-- generated. The operations are treated analogous. Axioms are

-- generated that each generated unary predicate must hold on at least

-- one element of the top-sort.

transSig :: Sign f e -> Result (Sign f e,[Named (FORMULA f)])

transSig sig

| Rel.isEmpty (sortRel sig) =

Result [Diag Warning ("CASL2TopSort.transSig: Signature is unchanged (no subsorting present)") nullPos] (Just (sig,[]))

| otherwise =

case generateSubSortMap (sortSet sig) (sortRel sig) (predMap sig) of

Result dias m_subSortMap ->

maybe (Result dias Nothing)

(\ subSortMap -> -- trace (show subSortMap) $

let (dias2,newPredMap) =

Map.mapAccum (\ds (un,ds1) -> (ds++ds1,un)) [] $

Map.unionWithKey repError

(transPredMap subSortMap (predMap sig))

(newPreds subSortMap)

(Result dias3 maxioms) =

generateAxioms subSortMap (predMap sig) (opMap sig)

dias' = dias ++ dias2 ++ dias3

in maybe (Result dias' Nothing)

(\axs -> Result dias' $ Just $

(sig { sortSet = Set.fromList $

map topSort_PI $ Map.elems subSortMap

, sortRel = Rel.fromList []

, opMap = transOpMap subSortMap (opMap sig)

, assocOps= transOpMap subSortMap (assocOps sig)

, predMap = newPredMap

},axs ++ symmetryAxioms subSortMap (sortRel sig)))

maxioms)

m_subSortMap

where

repError k (v1,d1) (v2,d2) =

(Set.union v1 v2,

(Diag Warning

("CASL2TopSort.transSig: generating "++

"overloading: Predicate "++show k++

" gets additional type(s): "++show v2) nullPos)

:d1++d2 )

newPreds mp =

foldr (\ pI nm -> Map.insert (predicate_PI pI)

(Set.single

(PredType [topSort_PI pI]),[]) nm)

Map.empty (Map.elems mp)

transPredMap :: SubSortMap -> Map.Map PRED_NAME (Set.Set PredType)

-> Map.Map PRED_NAME (Set.Set PredType,[Diagnosis])

transPredMap subSortMap = Map.map (\s -> (Set.image transType s,[]))

where transType t = t { predArgs = map (\s -> maybe s topSort_PI

(Map.lookup s subSortMap))

(predArgs t)}

transOpMap :: SubSortMap -> Map.Map OP_NAME (Set.Set OpType)

-> Map.Map OP_NAME (Set.Set OpType)

transOpMap subSortMap = Map.map (tidySet . Set.image transType)

where tidySet s = Set.fold joinPartial s s

where joinPartial t@(OpType {opKind = Partial})

| t {opKind = Total} `Set.member` s = Set.delete t

| otherwise = id

joinPartial _ = id

transType t =

t { opArgs = map lkp (opArgs t)

, opRes = lkp (opRes t)}

lkp = (\s -> maybe s topSort_PI (Map.lookup s subSortMap))

procOpMapping :: SubSortMap

-> OP_NAME -> Set.Set OpType

-> Result [Named (FORMULA f)] -> Result [Named (FORMULA f)]

procOpMapping subSortMap opName set r@(Result ds1 mal) =

case mkProfMapOp opName subSortMap set of

Result ds2 (Just profMap) ->

-- trace (show profMap)

(maybe r

(\al ->

Result (ds1++ds2)

(Just (al ++ Map.foldWithKey

procProfMapOpMapping

[] profMap))) mal)

Result ds2 Nothing -> Result (ds1++ds2) Nothing

where

procProfMapOpMapping :: [SORT] -> (FunKind,Set.Set [Maybe PRED_NAME])

-> [Named (FORMULA f)] -> [Named (FORMULA f)]

procProfMapOpMapping sl (kind,spl) =

genArgRest

(genSenName "o" opName (length sl))

(genOpEquation kind opName)

sl spl

symmetryAxioms :: SubSortMap -> Rel.Rel SORT -> [Named (FORMULA f)]

symmetryAxioms ssMap sortRel =

let symSets = Rel.symmetricSets sortRel

mR = Rel.mostRight sortRel

symTopSorts symSet = not (Set.isEmpty (Set.intersection mR symSet))

xVar = mkSimpleId "x"

updateLabel ts symS [sen] =

sen { senName = show ts++senName sen++show symS }

toAxioms symSet =

[updateLabel ts symS (inlineAxioms CASL

"sort ts pred symS:ts\n\

\forall xVar : ts\n\

\. symS(xVar) %(_symmetric_with_)%")

| s<-(Set.toList(symSet Set.\\ mR)),

let ts = lkupTop ssMap s,

let symS = fromJust (lkupPRED_NAME ssMap s)]

in concatMap toAxioms (Set.toList (Set.filter symTopSorts symSets))

generateAxioms :: SubSortMap -> Map.Map PRED_NAME (Set.Set PredType)

-> Map.Map OP_NAME (Set.Set OpType)

-> Result [Named (FORMULA f)]

generateAxioms subSortMap pMap oMap =

-- generate argument restrictions for operations

case Map.foldWithKey (procOpMapping subSortMap) (return []) oMap of

Result dias m_opAxs -> maybe (Result dias Nothing)

(\axs -> -- trace (show dias) $

Result dias

(Just (reverse hi_axs ++

reverse p_axs ++

reverse axs)))

m_opAxs

where p_axs =

-- generate argument restrictions for predicates

Map.foldWithKey (\ pName set al ->

case mkProfMapPred subSortMap set of

profMap ->

-- trace (show profMap)

(al ++ Map.foldWithKey

(\sl -> genArgRest

(genSenName "p" pName (length sl))

(genPredication pName)

sl)

[] profMap))

[] pMap

hi_axs =

-- generate subclass_of axioms derived from subsorts

-- and non-emptyness axioms

Map.fold (\ (PredInfo { topSort_PI = ts

, predicate_PI = subS

, directSuperSorts_PI = set

}) al ->

let supPreds =

map (\ s ->

maybe (error ("CASL2TopSort: genAxioms:"++

" impossible happend: "++show s))

predicate_PI (Map.lookup s subSortMap))

(Set.toList set)

x = mkSimpleId "x"

in al ++ zipWith (\sen supS -> sen { senName = show subS++

senName sen++

show supS })

(concat [inlineAxioms CASL

"sort ts\n\

\pred subS,supS: ts\n\

\ forall x : ts . subS(x) =>\n\

\ supS(x) %(_subclassOf_)%"|supS<-supPreds]

) supPreds ++

map (\sen -> sen { senName = show subS ++

senName sen})

(concat [inlineAxioms CASL

"sort ts\n\

\pred subS: ts \n\

\. exists x:ts . \n\

\ subS(x) %(_non_empty)%"])

) [] subSortMap

mkProfMapPred :: SubSortMap -> Set.Set PredType

-> Map.Map [SORT] (Set.Set [Maybe PRED_NAME])

mkProfMapPred ssm = Set.fold seperate Map.empty

where seperate pt = Map.setInsert (pt2topSorts pt) (pt2preds pt)

pt2topSorts = map (lkupTop ssm) . predArgs

pt2preds = map (lkupPRED_NAME ssm) . predArgs

mkProfMapOp :: OP_NAME -> SubSortMap -> Set.Set OpType

-> Result (Map.Map [SORT] (FunKind,Set.Set [Maybe PRED_NAME]))

mkProfMapOp opName ssm = Set.fold seperate (return Map.empty)

where seperate ot r@(Result dias mmap) =

maybe r

(\ mp -> Result dias'

(Just

(Map.insertWith (\ (k1,s1) (k2,s2) ->

(min k1 k2,Set.union s1 s2))

(pt2topSorts joinedList)

(fKind,

Set.single (pt2preds joinedList))

mp)))

mmap

where joinedList = opArgs ot ++ [opRes ot]

fKind = opKind ot

dias' = if fKind == Partial

then dias ++

[Diag Warning

("Please, check if operation \""++

show opName ++

"\" is still partial as intended,\

\ since a joining of types could\

\ have made it total!!")

nullPos]

else dias

pt2topSorts = map (lkupTop ssm)

pt2preds = map (lkupPRED_NAME ssm)

lkupTop :: SubSortMap -> SORT -> SORT

lkupTop ssm s = maybe s topSort_PI (Map.lookup s ssm)

lkupPRED_NAME :: SubSortMap -> SORT -> Maybe PRED_NAME

lkupPRED_NAME ssm s =

maybe Nothing (Just . predicate_PI) (Map.lookup s ssm)

genArgRest :: String

-> ([SORT] -> [TERM f] -> FORMULA f)

-- ^ generates from a list of variables

-- either the predication or function equation

-> [SORT] -> (Set.Set [Maybe PRED_NAME])

-> [Named (FORMULA f)] -> [Named (FORMULA f)]

genArgRest sen_name genProp sl spl fs =

let vars = genVars sl

mquant = genQuantification (genProp sl (map toSortTerm vars))

vars spl

in

fs ++

maybe [] (\quant ->

[NamedSen { senName = sen_name

, sentence = quant}])

mquant

-- | generate a predication with qualified pred name

genPredication :: PRED_NAME -> [SORT] -> [TERM f] -> FORMULA f

genPredication pName sl ts =

Predication (Qual_pred_name pName

(Pred_type sl []) [])

ts

[]

genOpEquation :: FunKind -> OP_NAME -> [SORT] -> [TERM f] -> FORMULA f

genOpEquation kind opName sl terms =

Strong_equation sortedFunTerm resTerm []

where sortedFunTerm =

Sorted_term (Application

(Qual_op_name opName

opType [])

argTerms

[])

resSort

[]

opType = case kind of

Partial -> Op_type Partial argSorts resSort []

Total -> Op_type Total argSorts resSort []

argTerms = init terms

resTerm = last terms

argSorts = init sl

resSort = last sl

toSortTerm :: TERM f -> TERM f

toSortTerm t@(Qual_var _ s _) = Sorted_term t s []

toSortTerm _ = error "CASL2TopSort.toSortTerm: can only handle Qual_var"

genVars :: [SORT] -> [TERM f]

genVars = zipWith toVarTerm varSymbs

where varSymbs = map mkSimpleId

(map (:[]) "xyzuwv"++

map (\i -> 'v':show i) [(1::Int)..])

toVarTerm vs s = (Qual_var vs s [])

genSenName :: Show a => String -> a -> Int -> String

genSenName suff symbName arity =

"arg_rest_"++ show symbName++'_':suff++'_':show arity

genQuantification :: FORMULA f -- ^ either the predication or

-- function equation

-> [TERM f] -- ^ Qual_vars

-> (Set.Set [Maybe PRED_NAME])

-> Maybe (FORMULA f)

genQuantification prop vars spl =

-- trace (show vds) $

maybe Nothing (\dis ->

Just (Quantification Universal vds

(Implication prop

dis

True []) []))

(genDisjunction vars spl)

where vds = reverse (foldl toVarDecl [] vars)

-- toVarDecl :: [VAR_DECL] -> TERM f -> [VAR_DECL]

toVarDecl [] (Qual_var n s _) = [Var_decl [n] s []]

toVarDecl xxs@((Var_decl l s1 []):xs) (Qual_var n s _)

| s1 == s = Var_decl (l++[n]) s1 []:xs

| otherwise = Var_decl [n] s []:xxs

toVarDecl _ _ =

error "CASL2TopSort.toVarDecl: can only handle Qual_var"

genDisjunction :: [TERM f] -- ^ Qual_vars

-> (Set.Set [Maybe PRED_NAME])

-> Maybe (FORMULA f)

genDisjunction vars spn

| Set.size spn == 1 =

case genConjunction [] (head (Set.toList spn)) of

[] -> Nothing

[x] -> Just x

_ -> error "CASL2TopSort.genDisjunction: this cannot happen"

| null disjs = Nothing

| otherwise = Just (Disjunction disjs [])

where disjs = foldl genConjunction [] (Set.toList spn)

genConjunction acc pns

| null conjs = acc

| otherwise = (Conjunction (reverse conjs) []):acc

where conjs = foldl genPred [] (zip vars pns)

-- genPred :: TERM f -> PRED_NAME -> FORMULA f

genPred acc (v@(Qual_var _ s _),mpn) =

maybe acc (\pn -> genPredication pn [s] [v]:acc) mpn

genPred _ _ =

error "CASL2TopSort.genPred: can only handle Qual_var"

partitionArity :: Int -> Set.Set PredType -> Map.Map Int [PredType]

partitionArity arity set

| arity == 1 = Map.insert arity (Set.toList set) Map.empty

| otherwise = case Set.partition

(\ x -> length (predArgs x) == arity) set of

(tt,ff) -> Map.insert arity (Set.toList tt)

(partitionArity (arity-1) ff)

combineTypes :: SubSortMap -> Map.Map Int [PredType]

-> Map.Map Int [Map.Map SORT (Set.Set SORT)]

combineTypes subSortMap =

Map.mapWithKey (\ arity types ->

foldr (\ t sl -> zipWith ins (predArgs t) sl)

(replicate arity Map.empty) types)

where ins so mp = maybe mp

(\v -> Map.setInsert (topSort_PI v) so mp)

(Map.lookup so subSortMap)

-- | Each membership test of a subsort is transformed to a predication

-- of the corresponding unary predicate. Variables quantified over a

-- subsort yield a premise to the quantified formula that the

-- corresponding predicate holds. All typings are adjusted according

-- to the subsortmap and sort generation constraints are translated to

-- disjointness axioms.

transSen :: (Show f) => Sign f e -> FORMULA f -> Result (FORMULA f)

transSen sig f

| Rel.isEmpty (sortRel sig) =

Result [Diag Warning ("CASL2TopSort.transSen: Sentence is unchanged (no subsorting present)") nullPos] (Just f)

| otherwise =

case (generateSubSortMap (sortSet sig)

(sortRel sig)

(predMap sig)) of

Result d Nothing -> Result d Nothing

Result d (Just ssm) ->

case mapSen ssm f of

Result d2 jf -> Result (d++d2) jf

mapSen :: (Show f) => SubSortMap -> FORMULA f -> Result (FORMULA f)

mapSen ssMap f =

case f of

sg@(Sort_gen_ax cs _) -> -- trace (show sg) $

genEitherAxiom ssMap cs

Mixfix_formula _ ->

error "CASL2TopSort.mapSen: cannot cope with Mixfix_formula"

Unparsed_formula _ _ ->

error "CASL2TopSort.mapSen: cannot cope with Unparsed_formula"

_ -> Result [] (Just (mapSen1 ssMap f))

mapSen1 :: (Show f) => SubSortMap -> FORMULA f -> FORMULA f

mapSen1 subSortMap f =

case f of

Conjunction fl pl -> Conjunction (map (mapSen1 subSortMap) fl) pl

Disjunction fl pl -> Disjunction (map (mapSen1 subSortMap) fl) pl

Implication f1 f2 b pl ->

Implication (mapSen1 subSortMap f1) (mapSen1 subSortMap f2) b pl

Equivalence f1 f2 pl ->

Equivalence (mapSen1 subSortMap f1) (mapSen1 subSortMap f2) pl

Negation f1 pl -> Negation (mapSen1 subSortMap f1) pl

tr@(True_atom _) -> tr

fa@(False_atom _) -> fa

Quantification q vdl f1 pl ->

Quantification q (map updateVarDecls vdl) (mapSen1 subSortMap f1) pl

Membership t s pl ->

let t' = mapTerm subSortMap t

in maybe (Membership t' s pl)

(\pn -> genPredication pn [lkupTop subSortMap s]

[t'])

(lkupPRED_NAME subSortMap s)

Existl_equation t1 t2 pl ->

Existl_equation (mapTerm subSortMap t1) (mapTerm subSortMap t2) pl

Strong_equation t1 t2 pl ->

Strong_equation (mapTerm subSortMap t1) (mapTerm subSortMap t2) pl

Definedness t pl ->

Definedness (mapTerm subSortMap t) pl

Predication psy tl pl ->

Predication (updatePRED_SYMB psy) (map (mapTerm subSortMap) tl) pl

Sort_gen_ax _ _ -> error "CASL2TopSort.mapSen: \

\Sort_gen_ax is not allowed as inner \

\formula"

ExtFORMULA f1 -> ExtFORMULA f1 -- ExtFORMULA stays as it is

Mixfix_formula _ ->

error "CASL2TopSort.mapSen: cannot cope with Mixfix_formula"

Unparsed_formula _ _ ->

error "CASL2TopSort.mapSen: cannot cope with Unparsed_formula"

where updateVarDecls (Var_decl vl s pl) =

Var_decl vl (lkupTop subSortMap s) pl

updatePRED_SYMB (Pred_name _) =

error "CASL2TopSort.mapSen: got untyped predication"

updatePRED_SYMB (Qual_pred_name pn (Pred_type sl pl') pl) =

Qual_pred_name pn

(Pred_type (map (lkupTop subSortMap) sl) pl') pl

mapTerm ::(Show f) => SubSortMap -> TERM f -> TERM f

mapTerm ssMap t =

case t of

Simple_id _ -> error "CASL2TopSort.mapTerm: unqualified variable found"

Qual_var v s pl -> Qual_var v (lTop s) pl

Application osy tl pl ->

Application (updateOP_SYMB osy) (map (mapTerm ssMap) tl) pl

Sorted_term t1 s pl ->

Sorted_term (mapTerm ssMap t1) (lTop s) pl

-- casts are discarded due to missing subsorting

Cast t1 _ _ -> mapTerm ssMap t1

Conditional t1 f t2 pl ->

Conditional (mapTerm ssMap t1) (mapSen1 ssMap f) (mapTerm ssMap t2) pl

Unparsed_term _ _ ->

error "CASL2TopSort.mapTerm: cannot cope with Unparsed_term"

_ ->

error "CASL2TopSort.mapTerm: cannot cope with any Mixfix_*"

where lTop = lkupTop ssMap

updateOP_SYMB (Op_name _) =

error "CASL2TopSort.mapTerm: got untyped application"

updateOP_SYMB (Qual_op_name on ot pl) =

Qual_op_name on (updateOP_TYPE ot) pl

updateOP_TYPE (Op_type fk sl s pl) =

Op_type fk (map lTop sl) (lTop s) pl

genEitherAxiom :: SubSortMap -> [Constraint] -> Result (FORMULA f)

genEitherAxiom ssMap =

genConjunction . (\ (_,osl,_) -> osl) . recover_Sort_gen_ax

where genConjunction osl =

let (injOps,constrs) = partition isInjOp osl

groupedInjOps = groupBy sameTarget injOps

in if null constrs

then case groupedInjOps of

[] -> Result [Diag Error

"No injective operation found" nullPos]

Nothing

[xs@(x:_)] -> Result [] (Just (genQuant x (genImpl xs)))

xs@((x:_):_) ->

Result [] (Just (genQuant x (Conjunction

(map genImpl xs) [])))

else Result [Diag Error

("CASL2TopSort: Cannot handle \

\datatype constructors; only subsort \

\embeddings are allowed with free and \

\generated types!") nullPos] Nothing

isInjOp ops =

case ops of

Op_name on -> error ("CASL2TopSort.genEitherAxiom: \

\Unqualified OP_NAME found: \""++

show on++"\"")

Qual_op_name on _ _ -> on == injName

resultSort (Qual_op_name _ (Op_type _ _ t _) _) = t

resultSort _ = error "CASL2TopSort.genEitherAxiom: \

\The Impossible Happened!!"

argSort (Qual_op_name _ (Op_type _ [x] _ _) _) = x

argSort _ = error "CASL2TopSort.genEitherAxiom: \

\The Impossible Happened!!"

sameTarget x1 x2 = resultSort x1 == resultSort x2

lTop = lkupTop ssMap

varName = mkSimpleId "x"

mkVarTerm qon =

Sorted_term (Qual_var varName s []) s []

where s = lTop (resultSort qon)

mkVarDecl qon =

Var_decl [varName] (lTop (resultSort qon)) []

genQuant qon f = Quantification Universal [mkVarDecl qon] f []

genImpl [] = error "No OP_SYMB found"

genImpl xs@(x:_) =

assert (lTop (resultSort x) == lTop (argSort x))

(if (resultSort x) == lTop (resultSort x)

then genDisj xs

else Implication (genProp x) (genDisj xs) True [])

genProp qon = genPredication (lPredName (resultSort qon))

[lTop (resultSort qon)]

[mkVarTerm qon]

lPredName s = maybe (error ("CASL2TopSort.genEitherAxiom: \

\No PRED_NAME for \""++show s

++"\" found!"))

id

(lkupPRED_NAME ssMap s)

genDisj qons = Disjunction (map genPred qons) []

genPred qon = genPredication (lPredName (argSort qon))

[lTop (resultSort qon)]

[mkVarTerm qon]