example with computer terminology from the Wikipedia

examples/computer/ComputerSwe.gf

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+--# -path=.:alltenses
+
+concrete ComputerSwe of Computer = DatorSwe, NumeralSwe, GrammarSwe [
+
+-- used to be the "mini" resource of GF book, chapter 9, but now larger
+
+-- cat
+    S,     -- sentence
+    Cl,    -- clause
+    NP,    -- noun phrase
+    VP,    -- verb phrase
+    AP,    -- adjectival phrase
+    CN,    -- common noun
+    Det,   -- determiner
+    N,     -- noun
+    A,     -- adjective
+    V,     -- verb (one-place, intransitive)
+    V2,    -- two-place verb (two-place, transitive or prepositional)
+    AdA,   -- ad-adjective
+    Tense, -- tense
+    Pol,   -- polarity
+    Conj,  -- conjunction
+
+    Pron,  -- pronoun
+    Numeral,
+
+--  fun
+    UseCl  , -- Tense -> Pol -> Cl -> S,
+    PredVP , -- NP -> VP -> Cl,
+---    ComplV2, -- V2 -> NP -> VP,
+    DetCN  , -- Det -> CN -> NP,
+    UsePron,
+---    ModCN  , -- AP -> CN -> CN,
+
+---    CompAP , -- AP -> VP,
+    AdAP   , -- AdA -> AP -> AP,
+
+---    ConjS  , -- Conj -> S  -> S  -> S,
+---    ConjAP , -- Conj -> AP -> AP -> AP,
+---    ConjNP , -- Conj -> NP -> NP -> NP,
+
+    UseV   , -- V -> VP,
+    UseN   , -- N -> CN,
+    PositA, -- A -> AP,
+
+---    a_Det, the_Det, 
+    every_Det, -- Det,
+---    this_Det, these_Det, -- Det,
+---    that_Det, those_Det, -- Det,
+    i_Pron, youSg_Pron, he_Pron, she_Pron, we_Pron, youPl_Pron, they_Pron, -- NP,
+    very_AdA, -- AdA,
+
+    TTAnt, -- Tense -> Ant -> Temp ;
+    PPos, PNeg, -- Pol,
+    TPres, TPast, TFut, TCond, -- Tense,
+       STense, SCond, SFut, SPast, SPres, -- scand tense
+    ASimul, AAnter,
+
+    and_Conj, or_Conj, -- Conj,
+
+-- extension of the mini grammar
+
+--  cat
+    Text,    -- text (with punctuation)          e.g. "Who knows it?"
+    Utt,     -- utterance (sentence or question) e.g. "does she walk"
+    QS,      -- question (fixed tense)           e.g. "who doesn't walk"
+    QCl,     -- question clause (variable tense) e.g. "who walks"
+    ClSlash, -- clause missing noun phrase       e.g. "she walks with"
+    Adv,     -- adverb                           e.g. "here"
+    Prep,    -- preposition (and/or case)        e.g. "with"
+    VS,      -- sentence-complement verb         e.g. "know"
+    VQ,      -- question-complement verb         e.g. "wonder"
+    VV,      -- verb-phrase-complement verb      e.g. "want"
+    IP,      -- interrogative pronoun            e.g. "who"
+    PN,      -- proper name                      e.g. "John"
+    Subj,    -- subjunction                      e.g. "because"
+    IAdv,    -- interrogative adverb             e.g. "why"
+
+    ListAP,
+    ListNP,
+    ListS,
+    Temp,
+    Comp,
+    Ant,
+
+    Imp, Bool, True, False, Voc,
+
+--  fun
+
+    UttS , -- S -> Utt,
+    UttQS, -- QS -> Utt,
+
+    UseQCl, -- Tense -> Pol -> QCl -> QS,
+    
+    QuestCl   , -- Cl -> QCl,             -- does she walk
+    QuestVP   , -- IP -> VP -> QCl,       -- who walks
+    QuestSlash, -- IP -> ClSlash -> QCl,  -- who does she walk with
+    QuestIAdv , -- IAdv -> Cl -> QCl,     -- why does she walk
+
+    SubjCl, -- Cl -> Subj -> S -> Cl,     -- she walks because we run
+
+    PrepNP , -- Prep -> NP -> Adv, -- in the house
+
+    ComplVS, -- VS -> S  -> VP,  -- know that she walks
+    ComplVQ, -- VQ -> QS -> VP,  -- wonder who walks
+    ComplVV, -- VV -> VP -> VP,  -- want to walk
+
+---    SlashV2  , -- NP -> V2 -> ClSlash,   -- she loves
+---    SlashPrep, -- Cl -> Prep -> ClSlash, -- she walks with
+
+    AdvVP, -- VP -> Adv -> VP, -- walk in the city
+
+    UsePN, -- PN -> NP,        -- John
+---    AdvNP, -- NP -> Adv -> NP, -- the man in the city
+
+    whoSg_IP , -- IP,
+    here_Adv, -- Adv,
+    by_Prep, in_Prep, of_Prep, with_Prep, -- Prep,
+    can_VV, must_VV, want_VV, -- VV,
+    although_Subj, because_Subj, when_Subj, if_Subj, -- Subj,
+    when_IAdv, where_IAdv, why_IAdv-- IAdv,
+
+] ** open SyntaxSwe, (S = SyntaxSwe) in {
+
+-- functions with different type
+
+lin
+   TextS s = mkText (lin S s) ;
+   TextQS qs = mkText (lin QS qs) ;
+   TextImp vp = mkText (mkImp (lin VP vp)) ;
+
+   ComplV2 v np = mkVP v np ;
+   ModCN ap cn = lin CN (mkCN <lin AP ap : AP> <lin CN cn : CN>) ;
+   CompAP ap = mkVP (lin AP ap) ;
+   ConjS co x y = mkS (lin Conj co) (lin S x) (lin S y) ;
+   ConjAP co x y = mkAP co x y ;
+   ConjNP co x y = mkNP co x y ;
+   a_Det = mkDet a_Quant ;
+   the_Det = mkDet the_Quant ;
+   aPl_Det = mkDet a_Quant plNum ;
+   thePl_Det = mkDet the_Quant plNum ;
+   this_Det = S.this_Det ;
+   these_Det = S.these_Det ;
+   that_Det = S.that_Det ;
+   those_Det = S.those_Det ;
+   possDet p = S.mkDet <p : Pron> ;
+   numeralDet n = S.mkDet <n : Numeral> ;
+   SubjS subj a b = mkS (S.mkAdv <subj : Subj> <a : S>) b ;
+   CompAdv p pp = mkVP (S.mkAdv <p : Prep> <pp : NP>) ;
+   SlashV2 np v2 = mkClSlash np v2 ;
+   SlashPrep cl p = mkClSlash (lin Cl cl) <p : Prep> ;
+   AdvCN cn p pp = mkCN <lin CN cn : CN> (mkAdv <p : Prep> <pp : NP>) ;
+}