richer extraction syntax

lib/resource/exper/abstract/Question.gf

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+--1 Question: Questions and Interrogative Pronouns
+
+abstract Question = Cat ** {
+
+-- A question can be formed from a clause ('yes-no question') or
+-- with an interrogative.
+
+  fun
+    QuestCl     : Cl -> QCl ;                  -- does John walk
+    QuestVP     : IP -> VP -> QCl ;            -- who walks
+    QuestSlash  : IP -> Slash -> QCl ;         -- who does John love
+    QuestIAdv   : IAdv -> Cl -> QCl ;          -- why does John walk
+    QuestIComp  : IComp -> NP -> QCl ;         -- where is John
+
+-- Interrogative pronouns can be formed with interrogative
+-- determiners. 
+
+    IDetCN  : IDet -> Num -> Ord -> CN -> IP;  -- which five best songs
+    AdvIP   : IP -> Adv -> IP ;                -- who in Europe
+
+    PrepIP  : Prep -> IP -> IAdv ;             -- with whom
+
+    CompIAdv : IAdv -> IComp ;                 -- where
+
+
+-- More $IP$, $IDet$, and $IAdv$ are defined in
+-- [``Structural`` Structural.html].
+
+}