Head-driven Phrase Structure Grammar I
Head-driven Phrase Structure Grammar I
Head-driven Phrase Structure Grammar I
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Basic Idea Typed feature structure HPSG: First glance<br />
Unification: Informal idea<br />
◮ Decide whether two typed feature structures are mutually<br />
compatible;<br />
◮ determine combination of two TFS’s to give the most general<br />
feature structure which retains all information which they<br />
individually contain;<br />
◮ if there is no such feature structure, unification fails;<br />
◮ unification monotonically combines information from both<br />
“input” TFS’s;<br />
◮ relation to subsumption: the unification of two structures F<br />
and F ′ is the most general TFS which is subsumed by both F<br />
and F ′ (if it exists).<br />
Weiwei Sun <strong>Head</strong>-<strong>driven</strong> <strong>Phrase</strong> <strong>Structure</strong> <strong>Grammar</strong> I 34/61
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