richer extraction syntax

resource/exper/abstract/Text.gf

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+--1 Text: Texts
+
+-- Texts are built from an empty text by adding $Phr$ases,
+-- using as constructors the punctuation marks ".", "?", and "!".
+-- Any punctuation mark can be attached to any kind of phrase.
+
+abstract Text = Common ** {
+
+  fun
+    TEmpty     : Text ;                 --
+    TFullStop  : Phr -> Text -> Text ;  -- John walks. ...
+    TQuestMark : Phr -> Text -> Text ;  -- Are you OK? ...
+    TExclMark  : Phr -> Text -> Text ;  -- John walks! ...
+
+}