Started experimenting with shallow resource API.

Started experimenting with shallow resource API.
Added PossessPrep to Structural.

lib/resource-0.6/shallow/Shallow.gf

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+-- Shallow.gf by AR 19/2/2004
+--
+-- This is a resource API for shallow parsing.
+-- It aims to be as unambiguous as possible: so it hides
+-- scope ambiguities.
+-- Therefore it has many more rules than would be necessary
+-- actually to define the language.
+-- It is not primarily aimed to be used through selection from the API,
+-- but through a parser.
+-- It can also serve for experiments with shallow (fast?) parsing.
+
+abstract Shallow = {
+  cat
+    Phr ;
+    S ;
+    Qu ;
+    Imp ;
+    Verb ;
+    TV ;
+    Adj ;
+    Noun ;
+    CN ;
+    NP ;
+    Adv ;
+    Prep ;
+
+  fun
+    PhrS : S -> Phr ;
+    PhrQu : Qu -> Phr ;
+    PhrImp : Imp -> Phr ;
+
+    SVerb, SNegVerb : NP -> Verb -> S ;
+    SVerbPP, SNegVerbPP : NP -> Verb -> Adv -> S ;
+    STV, SNegTV : NP -> TV -> NP -> S ;
+    SAdj, SNegAdj : NP -> Adj -> S ;
+    SAdjPP, SNegAdjPP : NP -> Adj -> Adv -> S ;
+    SCN, SNegCN : NP -> CN -> S ;
+    SAdv,SNegAdv : NP -> Adv -> S ;
+
+    QuVerb, QuNegVerb : NP -> Verb -> Qu ;
+
+    ImpVerb, ImpNegVerb : Verb -> Imp ;
+    ImpAdj, ImpNegAdj : Adj -> Imp ;
+    ImpCN, ImpNegCN : CN -> Imp ;
+    ImpAdv,ImpNegAdv : Adv -> Imp ;
+
+    ModNoun : Adj -> Noun -> Noun ;
+    PrepNP : Prep -> NP -> Adv ;
+    PrepNoun : CN -> Prep -> NP -> CN ;
+    CNNoun : Noun -> CN ;
+    DefNP, IndefNP, EveryNP, AllNP : CN -> NP ;
+
+    PossessPrep : Prep ;
+}