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Head-driven Phrase Structure Grammar I

Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance<br />

Type constraints and appropriate features: Informal idea<br />

◮ Well-formed TFS’s satisfy all type constraints from the<br />

type hierarchy.<br />

◮ Type constraints are typed feature structures associated<br />

with a type.<br />

◮ The top-level features of a type constraint are appropriate<br />

features.<br />

◮ Type constraints express generalizations over a “class”<br />

(set) of objects.<br />

Type Constraint Appropriate features<br />

*ne-list*<br />

] FIRST, REST<br />

[<br />

first ⊥<br />

*ne-list*<br />

rest<br />

*list*<br />

Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 46/61

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