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Head-driven Phrase Structure Grammar I

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

HPSG: Assumptions<br />

Two assumptions<br />

1. Languages are systems of sorts of linguistic objects at<br />

avariety of levels of abstraction.<br />

◮ <strong>Grammar</strong>s assign structural descriptions and semantic<br />

interpretations to linguistic objects.<br />

2. <strong>Grammar</strong>s are best represented as process-neutral systems<br />

of declarative constraints.<br />

◮ TG defines contraints in terms of operations on objects<br />

(movements).<br />

◮ TAG defines contraints in terms of adjunctions.<br />

Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 11/61

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