Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Sort-resolvedness ◮ The idea: Linguistic objects are entities of maximally specific sorts whose components are again of maximally specific sorts. ∗ Sort-resolvedness is not a necessary property of feature structures. An example drawn from (Pollard and Sag, 1994) ◮ word and phrase ◮ are immediate subsorts of sign and ◮ have no proper subsorts. ◮ We can talk about signs with AVMs, but in the real world ◮ we only find feature structures of the maximally specific sorts word or phrase; ◮ there is no such thing as a feature structure of type sign Weiwei Sun Head-driven Phrase Structure Grammar I 45/61
Basic Idea Typed feature structure HPSG: First glance Type constraints and appropriate features: Informal idea ◮ Well-formed TFS’s satisfy all type constraints from the type hierarchy. ◮ Type constraints are typed feature structures associated with a type. ◮ The top-level features of a type constraint are appropriate features. ◮ Type constraints express generalizations over a “class” (set) of objects. Type Constraint Appropriate features *ne-list* ] FIRST, REST [ first ⊥ *ne-list* rest *list* Weiwei Sun Head-driven Phrase Structure Grammar I 46/61
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Head-driven Phrase Structure Grammar I

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