abstract:Head-driven phrase structure grammar (HPSG) is a highly lexicalized, non-derivational generative grammar theory developed by Carl Pollard and Ivan Sag.Pollard, Carl, and Ivan A.
The constraint-based theories Head-drivenPhraseStructuregrammar (HPSG) andLexicalFunctionalGrammar (LFG) integrate syntaxand semantics in the account of anaphoric study.