a simpler and better Demo file set for resource grammars

lib/src/demo/DemoAra.gf

@@ -1,24 +1,10 @@
 --# -path=.:alltenses
 
-concrete DemoAra of Demo = 
-  NounAra - [AdvCN,PredetNP,PPartNP,RelNP,RelCN,SentCN,
-             ApposCN,MassNP,DetNP,ComplN3,Use2N3,Use3N3,AdvNP], 
---  VerbAra, 
-  ClauseAra, --
-  AdjectiveAra - [SentAP,ComplA2,UseA2,DemoA2],
-  AdverbAra,
-  NumeralAra,
-----  SentenceAra,
-  QuestionAra - [QuestVP,QuestSlash],
-----  RelativeAra,
-----  ConjunctionAra,
-----  PhraseAra,
-----  TextX,
-----  IdiomAra,
-  StructuralAra - [everybody_NP,everything_NP,something_NP],
-  LexiconAra
-  ** {
+concrete DemoAra of Demo = LangAra ** 
+  open LangAra in {
 
-flags startcat = Phr ; unlexer = text ; lexer = text ;
+  lin 
+    AdjN ap n = AdjCN ap (UseN n) ;
+    AdAdj ad a = AdAP ad (PositA a) ;
 
-} ;
+}