head-driven phrase structure grammar

Head-Driven Phrase Structure Grammar (HPSG) is a linguistic theory that explains how sentences are structured. It focuses on the "head" of a phrase, which is the central word that determines the phrase's category and meaning, like a noun in a noun phrase. HPSG uses a set of principles and rules to capture the relationships between words and their grammatical functions. It emphasizes the importance of both syntax (sentence structure) and semantics (meaning) in understanding language, allowing for a precise way to analyze how sentences convey information uniquely and accurately.