Feature cooccurrence restrictions

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.

Example

Only verbal catgories can contain the feature vform: [VFORM] <math>\rightarrow</math> [+V, -N]

Phrasal catgories can not contain the feature subcat: [BAR 2] <math>\rightarrow</math> <math>\neg</math> [SUBCAT]

Comments

Modern unification-based grammar formalisms like Head-Driven Phrase Structure Grammar use typed feature structures instead.

Other Languages

• German Feature cooccurrence restrictions (de)