56 lines
1.1 KiB
Plaintext
56 lines
1.1 KiB
Plaintext
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## Natural Language Toolkit: feat1.fcfg
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##
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## Second example of a feature-based grammar, illustrating
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## SUBCAT and slash features. Also introduces SBar and embedded
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## clauses.
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## Used in Feature-Based Grammars chapter.
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##
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## Author: Ewan Klein <ewan@inf.ed.ac.uk>
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## URL: <http://nltk.sourceforge.net>
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## For license information, see LICENSE.TXT
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% start S
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# ###################
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# Grammar Productions
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# ###################
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S[-INV] -> NP VP
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S[-INV]/?x -> NP VP/?x
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S[-INV] -> NP S/NP
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S[-INV] -> Adv[+NEG] S[+INV]
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S[+INV] -> V[+AUX] NP VP
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S[+INV]/?x -> V[+AUX] NP VP/?x
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SBar -> Comp S[-INV]
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SBar/?x -> Comp S[-INV]/?x
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VP -> V[SUBCAT=intrans, -AUX]
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VP -> V[SUBCAT=trans, -AUX] NP
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VP/?x -> V[SUBCAT=trans, -AUX] NP/?x
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VP -> V[SUBCAT=clause, -AUX] SBar
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VP/?x -> V[SUBCAT=clause, -AUX] SBar/?x
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VP -> V[+AUX] VP
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VP/?x -> V[+AUX] VP/?x
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# ###################
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# Lexical Productions
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# ###################
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V[SUBCAT=intrans, -AUX] -> 'walk' | 'sing'
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V[SUBCAT=trans, -AUX] -> 'see' | 'like'
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V[SUBCAT=clause, -AUX] -> 'say' | 'claim'
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V[+AUX] -> 'do' | 'can'
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NP[-WH] -> 'you' | 'cats'
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NP[+WH] -> 'who'
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Adv[+NEG] -> 'rarely' | 'never'
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NP/NP ->
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Comp -> 'that'
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