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# Cat: the Category System

The category system is central to the library in the sense that the other modules (`Adjective`, `Adverb`, `Noun`, `Verb` etc) communicate through it. This means that a e.g. a function using `NP`s in `Verb` need not know how `NP`s are constructed in `Noun`: it is enough that both `Verb` and `Noun` use the same type `NP`, which is given here in `Cat`. Some categories are inherited from [``Common`` Common.html]. The reason they are defined there is that they have the same implementation in all languages in the resource (typically, just a string). These categories are `AdA, AdN, AdV, Adv, Ant, CAdv, IAdv, PConj, Phr`, `Pol, SC, Tense, Text, Utt, Voc, Interj`.

Moreover, the list categories `ListAdv, ListAP, ListNP, ListS` are defined on `Conjunction` and only used locally there.

      abstract Cat = Common ** {

        cat

## Sentences and clauses

Constructed in [Sentence Sentence.html], and also in [Idiom Idiom.html].

          S ;     -- declarative sentence                e.g. "she lived here"
          QS ;    -- question                            e.g. "where did she live"
          RS ;    -- relative                            e.g. "in which she lived"
          Cl ;    -- declarative clause, with all tenses e.g. "she looks at this"
          ClSlash;-- clause missing NP (S/NP in GPSG)    e.g. "she looks at"
          SSlash ;-- sentence missing NP                 e.g. "she has looked at"
          Imp ;   -- imperative                          e.g. "look at this"

## Questions and interrogatives

Constructed in [Question Question.html].

          QCl ;   -- question clause, with all tenses    e.g. "why does she walk"
          IP ;    -- interrogative pronoun               e.g. "who"
          IComp ; -- interrogative complement of copula  e.g. "where"
          IDet ;  -- interrogative determiner            e.g. "how many"
          IQuant; -- interrogative quantifier            e.g. "which"

## Relative clauses and pronouns

Constructed in [Relative Relative.html].

          RCl ;   -- relative clause, with all tenses    e.g. "in which she lives"
          RP ;    -- relative pronoun                    e.g. "in which"

## Verb phrases

Constructed in [Verb Verb.html].

          VP ;      -- verb phrase                       e.g. "is very warm"
          Comp ;    -- complement of copula, such as AP  e.g. "very warm"
          VPSlash ; -- verb phrase missing complement    e.g. "give to John"

## Adjectival phrases

Constructed in [Adjective Adjective.html].

          AP ;    -- adjectival phrase                   e.g. "very warm"

## Nouns and noun phrases

Constructed in [Noun Noun.html]. Many atomic noun phrases e.g. everybody are constructed in [Structural Structural.html]. The determiner structure is ``` Predet (QuantSg | QuantPl Num) Ord as defined in [Noun Noun.html].

          CN ;     -- common noun (without determiner)    e.g. "red house"
          NP ;     -- noun phrase (subject or object)     e.g. "the red house"
          Pron ;   -- personal pronoun                    e.g. "she"
          Det ;    -- determiner phrase                   e.g. "those seven"
          Predet ; -- predeterminer (prefixed Quant)      e.g. "all"
          Quant ;  -- quantifier ('nucleus' of Det)       e.g. "this/these"
          Num ;    -- number determining element          e.g. "seven"
          Card ;   -- cardinal number                     e.g. "seven"
          Ord ;    -- ordinal number (used in Det)        e.g. "seventh"

## Numerals

Constructed in [Numeral Numeral.html].

          Numeral ; -- cardinal or ordinal in words       e.g. "five/fifth"
          Digits ;  -- cardinal or ordinal in digits      e.g. "1,000/1,000th"

## Structural words

Constructed in [Structural Structural.html].

          Conj ;  -- conjunction                         e.g. "and"

-b DConj ; -- distributed conjunction e.g. both - and

          Subj ;  -- subjunction                         e.g. "if"
          Prep ;  -- preposition, or just case           e.g. "in"

## Words of open classes

These are constructed in [Lexicon Lexicon.html] and in additional lexicon modules.

          V ;     -- one-place verb                      e.g. "sleep"
          V2 ;    -- two-place verb                      e.g. "love"
          V3 ;    -- three-place verb                    e.g. "show"
          VV ;    -- verb-phrase-complement verb         e.g. "want"
          VS ;    -- sentence-complement verb            e.g. "claim"
          VQ ;    -- question-complement verb            e.g. "wonder"
          VA ;    -- adjective-complement verb           e.g. "look"
          V2V ;   -- verb with NP and V complement       e.g. "cause"
          V2S ;   -- verb with NP and S complement       e.g. "tell"
          V2Q ;   -- verb with NP and Q complement       e.g. "ask"
          V2A ;   -- verb with NP and AP complement      e.g. "paint"

          A ;     -- one-place adjective                 e.g. "warm"
          A2 ;    -- two-place adjective                 e.g. "divisible"

          N ;     -- common noun                         e.g. "house"
          N2 ;    -- relational noun                     e.g. "son"
          N3 ;    -- three-place relational noun         e.g. "connection"
          PN ;    -- proper name                         e.g. "Paris"

DEPRECATED: QuantSg, QuantPl - QuantSg ;-- quantifier ('nucleus' of sing. Det) e.g. every - QuantPl ;-- quantifier ('nucleus' of plur. Det) e.g. many

      }