Head-driven Phrase Structure Grammar I
Head-driven Phrase Structure Grammar I Head-driven Phrase Structure Grammar I
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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Basic Idea Typed feature structure HPSG: First glance<br />
Feature structures in HPSG<br />
◮ local introduces CAT(cateogry), CONT(content) and<br />
CONX(context)<br />
◮ non-local is connected with unbounded dependencies<br />
◮ category includes,<br />
◮ The sign’s syntactic category<br />
◮ Given via the feature [HEAD head], where head is the<br />
supertype for noun, verb, adjective, preposition, determiner,<br />
marker<br />
◮ each of these types selects a particular set of head features<br />
◮ The sign’s subcategorzation frame/valence.<br />
◮<br />
⎡Three list-valued features<br />
⎤<br />
⎡<br />
⎤<br />
subj list(synsem)<br />
⎢<br />
⎢<br />
⎥<br />
⎣<br />
synsem | loc | cat | valence ⎣spec<br />
list(synsem) ⎦⎥<br />
⎦<br />
comps list(synsem)<br />
valuence<br />
◮ If any of these lists are non-empty, the sign has the potential<br />
to combine with another sign<br />
Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 55/61
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