Difference between revisions of "Feature cooccurrence restrictions"
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| − | '''Feature cooccurrence restrictions''' (FCRs) formulate well-formedness conditions for feature structures | + | [[Generalized Phrase Structure Grammar]] (GPSG) uses '''Feature cooccurrence restrictions''' (FCRs) to formulate well-formedness conditions for feature structures. As GPSG takes feature structures to be arbitrary sets of feature specifications, it is necessary to block the combination of feature specifications which from a linguistic point of view make no sense. Most FCRs are formulated as implications. |
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| + | Many theories of phonological features also apply FCRs: pairs of features, or pairs of features together with their values, that cannot cooccur within a segment. | ||
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| + | ===Examples=== | ||
| + | Only verbal catgories can contain the feature ''vform'': [VFORM] <math>\rightarrow</math> [+V, -N] | ||
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| + | Phrasal catgories cannot contain the feature ''subcat'': [BAR 2] <math>\rightarrow</math> <math>\neg</math> [SUBCAT] | ||
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| + | The vocalic fatures [+high] and [+low] cannot cooccur: [+high] <math>\rightarrow</math> [-low] && [+low] <math>\rightarrow</math> [-high] | ||
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| + | ===Comments=== | ||
| + | Modern unification-based grammar formalisms like [[Head-Driven Phrase Structure Grammar]] use [[typed feature structures]] instead. | ||
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| + | ===Other Languages=== | ||
| + | * German [[Feature cooccurrence restrictions (de)]] | ||
| + | {{dc}}{{ref}} | ||
| + | [[Category:Syntax]] | ||
Latest revision as of 16:17, 29 June 2014
Generalized Phrase Structure Grammar (GPSG) uses Feature cooccurrence restrictions (FCRs) to formulate well-formedness conditions for feature structures. As GPSG takes feature structures to be arbitrary sets of feature specifications, it is necessary to block the combination of feature specifications which from a linguistic point of view make no sense. Most FCRs are formulated as implications.
Many theories of phonological features also apply FCRs: pairs of features, or pairs of features together with their values, that cannot cooccur within a segment.
Examples
Only verbal catgories can contain the feature vform: [VFORM] <math>\rightarrow</math> [+V, -N]
Phrasal catgories cannot contain the feature subcat: [BAR 2] <math>\rightarrow</math> <math>\neg</math> [SUBCAT]
The vocalic fatures [+high] and [+low] cannot cooccur: [+high] <math>\rightarrow</math> [-low] && [+low] <math>\rightarrow</math> [-high]
Comments
Modern unification-based grammar formalisms like Head-Driven Phrase Structure Grammar use typed feature structures instead.
Other Languages
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