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 />
Typed feature structure: Informal Idea<br />
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◮ TFS’s can be represented as rooted directed labeled graphs:<br />
◮ Nodes are labeled with types<br />
◮ Edges are labeled with features.<br />
◮ A feature path is a list of features through a feature structure<br />
leading to a particular value.<br />
◮ Reentrancy/structure-sharing: two attributes denote identical<br />
information.<br />
Example<br />
predicate<br />
subj<br />
P RED<br />
noun<br />
verb<br />
AGR<br />
agreement<br />
P ERS<br />
AGR<br />
NUM<br />
3rd<br />
singular<br />
Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 22/61
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