Head-driven Phrase Structure Grammar I

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Basic Idea Typed feature structure HPSG: First glance Feature structures in HPSG ◮ HPSG is nonderivational, but in some sense, HPSG has several different levels (layers of features) ◮ Each of these feature values is itself a complex object. Signs in HPSG Sign is the basic sort/type in HPSG used to describe lexical items (of type word) and phrases (of type phrase). ◮ The type sign has the features PHON and SYNSEM. ◮ The feature SYNSEM has a value of type synsem ◮ This type itself has relevant features (LOCAL and NONLOCAL) ◮ ... sign ⎡ phon ⎢ ⎣synsem ⎤ list(phone-string) [ ] local local ⎥ ⎦ nonlocal nonlocal synsem Weiwei Sun Head-driven Phrase Structure Grammar I 54/61
Basic Idea Typed feature structure HPSG: First glance Feature structures in HPSG ◮ local introduces CAT(cateogry), CONT(content) and CONX(context) ◮ non-local is connected with unbounded dependencies ◮ category includes, ◮ The sign’s syntactic category ◮ Given via the feature [HEAD head], where head is the supertype for noun, verb, adjective, preposition, determiner, marker ◮ each of these types selects a particular set of head features ◮ The sign’s subcategorzation frame/valence. ◮ ⎡Three list-valued features ⎤ ⎡ ⎤ subj list(synsem) ⎢ ⎢ ⎥ ⎣ synsem | loc | cat | valence ⎣spec list(synsem) ⎦⎥ ⎦ comps list(synsem) valuence ◮ If any of these lists are non-empty, the sign has the potential to combine with another sign Weiwei Sun Head-driven Phrase Structure Grammar I 55/61
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Head-driven Phrase Structure Grammar I

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