Head-driven Phrase Structure Grammar I
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