initial Slavic grammar, shared between Bulgarian and Russian

next-lib/src/slavic/CatSlavic.gf

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+incomplete concrete CatSlavic of Cat = open Prelude, CommonSlavic, ResSlavic in {
+
+lincat
+  CN = {s : NForm => Str; g : Gender; anim : Animacy} ;
+
+  N  = {s : NForm => Str; g : Gender; anim : Animacy} ;
+  N2 = {s : NForm => Str; g : Gender; anim : Animacy} ** {c2 : Preposition} ;
+  N3 = {s : NForm => Str; g : Gender; anim : Animacy} ** {c2,c3 : Preposition} ;
+}

next-lib/src/slavic/CommonSlavic.gf

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+resource CommonSlavic = ParamX ** open Prelude in {
+
+param
+  Gender = Masc | Fem | Neut ;
+  Animacy = Animate | Inanimate ;
+}

next-lib/src/slavic/DiffSlavic.gf

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+interface DiffSlavic = open Prelude in {
+
+  param NForm ;
+
+}

next-lib/src/slavic/ResSlavic.gf

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+interface ResSlavic = DiffSlavic ** open CommonSlavic, Prelude in {
+
+oper
+  Preposition : Type = {s : Str; c : Case};
+
+}