paraphrase works a little better now ; added examples/paraphrase for testing

examples/paraphrase/City.gf

@@ -0,0 +1,26 @@
+abstract City = {
+
+cat S ; City ; Country ; Adj ;
+
+data
+  PredIn : City -> Country -> S ;
+fun
+  PredAdj    : City -> Adj -> S ;
+  Capital    : Country -> City ;
+  CountryAdj : Adj -> Country ;
+data
+  Stockholm, Helsinki : City ;
+  Sweden, Finland : Country ;
+  Swedish, Finnish : Adj ;
+
+def
+  PredAdj city x = PredIn city (CountryAdj x) ;
+
+  Capital Finland = Helsinki ;
+  Capital Sweden = Stockholm ;
+
+  CountryAdj Finnish = Finland ;
+  CountryAdj Swedish = Sweden ;
+
+
+}

examples/paraphrase/CityEng.gf

@@ -0,0 +1,16 @@
+concrete CityEng of City = {
+
+lincat S, City, Country, Adj = Str ;
+
+lin
+  PredIn ci co = ci ++ "is in" ++ co ;
+  PredAdj ci ad = ci ++ "is" ++ ad ;
+  Capital co = "the capital of" ++ co ;
+  CountryAdj ad = "the" ++ ad ++ "country" ;
+  Stockholm = "Stockholm" ;
+  Helsinki = "Helsinki" ;
+  Sweden = "Sweden" ;
+  Finland = "Finland" ;
+  Swedish = "Swedish" ;
+  Finnish = "Finnish" ;
+}

examples/paraphrase/Nat.gf

@@ -0,0 +1,29 @@
+abstract Nat = {
+
+cat Nat ;
+
+data 
+  Zero : Nat ;
+  Succ : Nat -> Nat ;
+  
+fun one : Nat ;
+def one = Succ Zero ;
+
+fun plus : Nat -> Nat -> Nat ;
+def plus x Zero = x ;
+def plus x (Succ y) = Succ (plus x y) ;
+
+fun twice : Nat -> Nat ;
+def twice x = plus x x ;
+
+fun times : Nat -> Nat -> Nat ;
+def times x Zero = Zero ;
+def times x (Succ y) = plus (times x y) x ;
+
+fun four : Nat ;
+def four = twice (twice one) ;
+
+fun exp : Nat -> Nat ;
+def exp Zero = one ;
+def exp (Succ x) = twice (exp x) ;
+}