Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Type constraints and appropriate features: Formal stuff (skip) Types are associated with constraints expressed as TFS’s. ◮ Constraint function C : T ↦→ FS ◮ Define conditions on the constraint function. ◮ For each type there is a set of features appropriate to that type AppFeat : T ↦→ F Definition ◮ Feat(F, q) is defined to be the set of features labeling transitions from the node q in some feature structure F i.e. f ∈ Feat(F, q) such that δ(f, q) is defined. ◮ If C(t) = 〈Q, r, δ, θ〉, then the appropriate features of t are defined as Appfeat(t) = Feat(F, r). Weiwei Sun Head-driven Phrase Structure Grammar I 47/61
Basic Idea Typed feature structure HPSG: First glance Type constraints and appropriate features: Formal stuff (skip) Definition: Well-formed feature structures F = 〈Q, r, δ, θ〉 is a well-formed feature structure if and only if for all q ∈ Q, we have that 1. C(θ(q)) ⊑ F ′ = 〈Q ′ , q, δ, θ〉 2. Feat(F, q) = Appfeat(θ(q)). Weiwei Sun Head-driven Phrase Structure Grammar I 48/61
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Head-driven Phrase Structure Grammar I

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