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 />
Motivation<br />
CFG treats each grammatical category symbol as atomic without<br />
internal structure.<br />
⇒ Two categories are either identical or different.<br />
⇒ There is no mechanism for saying that two categories are alike<br />
in some ways, but different in others.<br />
Words and phrases in NLs typically behave alike in certain<br />
respects, but not others.<br />
Cross-cutting grammatical properties<br />
3rd singular subject plural subject<br />
direct object NP denies deny<br />
No direct object NP disappears disappear<br />
Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 3/61