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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 />

Developing a feature structure based syntactic theory<br />

Type ⇒ Typed feature structure<br />

◮ One of the first things in developing a theory of grammars<br />

is to classify linguistic entities.<br />

◮ Paradigmatic relations: We cluster “good” feature<br />

structures into various types.<br />

◮ Syntagmatic relations: We combine “good” feature<br />

structures according to several general principles.<br />

◮ HPSG employs Typed feature structure (TFS), a<br />

mathematical device, to express symbolic and structured<br />

constraints of linguistic objects.<br />

1. Types are associated with feature-value constraints<br />

expressed as TFS’s.<br />

2. Linguistic objects “of the same type” share its<br />

feature-value constraints.<br />

3. A concrete linguistic object may define other feature-value<br />

constraints, which are compatible with its type.<br />

Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 13/61

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