Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Reentrancy: Informal Idea Agreement and valence ◮ S → [ ] pos noun [ ] pos verb num 1 num 1 phrase phrase ⎡ ⎤ ◮ [ ] pos verb pos verb ⎢ ⎥ → ⎣num 1 ⎦ num 1 phrase val itr word ⎡ ⎤ ◮ [ ] pos verb pos verb ⎢ ⎥ → ⎣num 1 ⎦NP num 1 phrase val tr phrase ⎡ ⎤ ◮ [ ] pos verb pos verb ⎢ ⎥ → ⎣num 1 ⎦NP NP num 1 phrase val tr phrase Weiwei Sun Head-driven Phrase Structure Grammar I 29/61
Basic Idea Typed feature structure HPSG: First glance Reentrancy: Formal Definition ◮ A path is understood as a sequence of features: π ∈ F + . ◮ δ(n, π) is the value node starting from n following path π. Definition If δ(r, π) = δ(r, π ′ ) and π = π ′ , i.e. two paths start from the root of the feature structure and point to the same node, then it is said there is a reentrancy between path π and π ′ Feature path ⎡ ⎡ [ ]⎤ ⎤ person 3rd subj ⎣agr 1 ⎦ num singular agreement ⎢ noun ⎣ ] ⎥ ⎦ pred [agr 1 verb Path: 〈SUBJ, AGR, NUM 〉 = singular Weiwei Sun Head-driven Phrase Structure Grammar I 30/61
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Head-driven Phrase Structure Grammar I

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