Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Type hierarchy: Informal idea Given two types σ, τ, we usually want to talk about: ◮ σ is more general than τ ◮ τ is more specific than σ ◮ σ is a supertype of τ ◮ τ is a subtype of σ ◮ One unique type subsumes all other types ◮ Types without any subtype are called maximal types. Weiwei Sun Head-driven Phrase Structure Grammar I 17/61
Basic Idea Typed feature structure HPSG: First glance Type hierarchy: Subsumption ◮ T : is a finite set of types ◮ ⊑: a partial order defined on T ◮ Reflexive: σ ⊑ σ ◮ Antisymmetric: if σ ⊑ τ and τ ⊑ σ then σ = τ ◮ Transitive: if σ ⊑ ω and ω ⊑ τ then σ ⊑ τ ◮ Subsumption: For types σ, τ ∈ T , σ subsumes or is more general than or is a supertype of τ, when σ ⊑ τ. ◮ τ is subsumed by or is more specific than or is a subtype of σ. Example dolphin elephant salmon aquatic-animal terrestrial-animal mammal fish animal Weiwei Sun Head-driven Phrase Structure Grammar I 18/61
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Head-driven Phrase Structure Grammar I

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