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 TFS for linguistic description: An example Example ⎡ 〈 〉 ⎤ phon she ⎡ ⎡ ⎡ [ ] ⎤ ⎤ head case nom noun ⎡ ⎤ cat subj 〈〉 ⎢ ⎢ ⎥ valence ⎣ ⎣comps 〈〉 ⎦ ⎥ ⎦ spr 〈〉 cat val ⎡ ⎡ ⎤⎤ ss per 3rd loc ⎢ ⎥ index 1 ⎣num sing⎦ cont ⎢ gend fem ⎥ ⎣ ref ⎦ restr {} ppro ⎡ ⎧ [ ]⎫ ⎤ ⎨ ⎢ ⎢ ⎢ reln female ⎬ ⎢ ⎣ ⎣conx ⎣bkgr ⎩ inst 1 ⎭ ⎦ ⎦⎥ ⎣ psoa ⎦ synsem local context word Weiwei Sun Head-driven Phrase Structure Grammar I 43/61
Basic Idea Typed feature structure HPSG: First glance Appropriateness of feature structures: Motivated idea Pollard and Sag (1994: 8) require the HPSG architecture to use TFS as models of linguistic objects. They assume the underlying mathematical models to be totally well-typed and sort-resolved feature structures. Totally well-typedness ◮ What attribute labels can appear in a feature structure is determined by its sort. ◮ Every feature that is appropriate for the sort assigned to that node is actually present. Sort-resolvedness ◮ Every node is assigned a most specific type as value. ◮ Types that do not subsume any other sorts (except for themselves) are called maximally specific types/sorts. ◮ A type is a disjunction of its maximally specific subtypes. Weiwei Sun Head-driven Phrase Structure Grammar I 44/61
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Basic Idea Typed feature structure HPSG: First glance<br />
TFS for linguistic description: An example<br />
Example<br />
⎡ 〈 〉<br />
⎤<br />
phon she<br />
⎡<br />
⎡ ⎡<br />
[<br />
] ⎤<br />
⎤<br />
head<br />
case nom<br />
noun<br />
⎡ ⎤<br />
cat<br />
subj 〈〉<br />
⎢<br />
⎢ ⎥<br />
valence<br />
⎣<br />
⎣comps 〈〉 ⎦ ⎥<br />
⎦<br />
spr 〈〉<br />
cat<br />
val<br />
⎡<br />
⎡<br />
⎤⎤<br />
ss<br />
per 3rd<br />
loc<br />
⎢<br />
⎥<br />
index 1 ⎣num<br />
sing⎦<br />
cont<br />
⎢<br />
gend fem ⎥<br />
⎣<br />
ref<br />
⎦<br />
restr {}<br />
ppro<br />
⎡<br />
⎧ [ ]⎫ ⎤<br />
⎨<br />
⎢<br />
⎢ ⎢<br />
reln female ⎬ ⎢ ⎣<br />
⎣conx<br />
⎣bkgr<br />
⎩ inst 1<br />
⎭<br />
⎦<br />
⎦⎥<br />
⎣<br />
psoa ⎦<br />
synsem<br />
local<br />
context<br />
word<br />
Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 43/61
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