Feature structures and unification
Feature structures
- Sets of (morphological, syntactic, semantic, pragmatic) features and their
associated values
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Values either base (primitive) expressions or feature structures
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Structure sharing, feature structures as DAGs
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Representation of constraints
- Grammatical agreement
- Equivalence of arguments
Unification of feature structures
- Maintaining constraints between feature structures
- Relating specific and general knowledge
- Filling in missing information
- Unification in analysis and generation
