preparing for 2023

lab2/wikipedia-2022/Countries.gf

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+abstract Countries = Facts, CountryNames ** {
+fun
+-- using CNames
+  cName : CName -> Name ;
+
+-- basic properties
+  capital_Attribute : Attribute ;
+  area_Attribute : Attribute ;
+  population_Attribute : Attribute ;
+  continent_Attribute : Attribute ;
+  currency_Attribute : Attribute ;
+
+-- specialized expressions for properties
+  populationFact : CName -> Int -> Fact ;
+  continentFact : CName -> CName -> Fact ;
+}