Difference between revisions of "Feature cooccurrence restrictions"
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[[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. | [[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. | ||
===Example=== | ===Example=== | ||
Only verbal catgories can contain the feature ''vform'': [VFORM] <math>\rightarrow</math> [+V, -N] | Only verbal catgories can contain the feature ''vform'': [VFORM] <math>\rightarrow</math> [+V, -N] | ||
| − | Phrasal catgories | + | 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=== | ===Comments=== | ||
Revision as of 08:52, 5 March 2009
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.
Example
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.
