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Head-driven Phrase Structure Grammar I

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

TFS for linguistic description<br />

How should I model linguistic objects by FEATURES<br />

In practice,<br />

◮ The grammar specifies partial descriptions of type constraints,<br />

which are automatically expanded to give constraint<br />

structures which meet the conditions given.<br />

◮ Once a type system is defined, specifications of rules and<br />

lexical entries are expanded so that they are well-formed<br />

according to the type system.<br />

Question<br />

Why so many Greek symbols<br />

Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 41/61

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