Grammar without lexicon, new top module

lib/resource-1.0/abstract/Grammar.gf

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+--1 The Main Module of the Resource Grammar
+
+-- This grammar a collection of the different grammar modules,
+-- To test the resource, import [Lang Lang.html], which also contains
+-- a lexicon.
+
+abstract Grammar = 
+  Noun,
+  Verb, 
+  Adjective,
+  Adverb,
+  Numeral,
+  Sentence, 
+  Question,
+  Relative,
+  Conjunction,
+  Phrase,
+  Text,
+  Structural,
+  Idiom
+  ** {} ;