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lib/resource/abstract/Common.gf

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+--1 Common: Structures with Common Implementations.
+
+-- This module defines the categories that uniformly have the linearization
+-- ${s : Str}$ in all languages. 
+
+-- Moreover, this module defines the abstract parameters of tense, polarity, and
+-- anteriority, which are used in [``Phrase`` Phrase.html] to generate different
+-- forms of sentences. Together they give 4 x 2 x 2 = 16 sentence forms.
+
+-- These tenses are defined for all languages in the library. More tenses
+-- can be defined in the language extensions, e.g. the "passé simple" of
+-- Romance languages in [``ExtraRomance`` ../romance/ExtraRomance.gf].
+
+abstract Common = {
+
+  cat
+
+--2 Top-level units
+
+-- Constructed in [``Text`` Text.html]: $Text$.
+
+    Text ;  -- text consisting of several phrases  e.g. "He is here. Why?"
+
+-- Constructed in [``Phrase`` Phrase.html]:
+
+    Phr ;   -- phrase in a text                    e.g. "but be quiet please"
+    Utt ;   -- sentence, question, word...         e.g. "be quiet"
+    Voc ;   -- vocative or "please"                e.g. "my darling"
+    PConj ; -- phrase-beginning conjunction        e.g. "therefore"
+
+-- Constructed in [``Sentence`` Sentence.html]:
+
+    SC ;    -- embedded sentence or question       e.g. "that it rains"
+
+--2 Adverbs
+
+-- Constructed in [``Adverb`` Adverb.html].  
+-- Many adverbs are constructed in [``Structural`` Structural.html].
+
+    Adv ;   -- verb-phrase-modifying adverb        e.g. "in the house"
+    AdV ;   -- adverb directly attached to verb    e.g. "always"
+    AdA ;   -- adjective-modifying adverb          e.g. "very"
+    AdN ;   -- numeral-modifying adverb            e.g. "more than"
+    IAdv ;  -- interrogative adverb                e.g. "why"
+    CAdv ;  -- comparative adverb                  e.g. "more"
+
+--2 Tense, polarity, and anteriority
+
+    Tense ; -- tense                               e.g. present, past, future
+    Pol ;   -- polarity                            e.g. positive, negative
+    Ant ;   -- anteriority                         e.g. simultaneous, anterior
+
+  fun
+    PPos, PNeg : Pol ;           -- I sleep/don't sleep
+
+    TPres  : Tense ;                
+    ASimul : Ant ;
+    TPast, TFut, TCond : Tense ; -- I slept/will sleep/would sleep --# notpresent
+    AAnter : Ant ;               -- I have slept                   --# notpresent
+
+}