Head-driven Phrase Structure Grammar I

Basic Idea Typed feature structure HPSG: First glance
Unification: An example (4)
{q 3 , q ′ 6 }
{q 0 , q ′ 0 } SUBJ
P RED
{q 1 , q ′ 1 } AGR
{q 4 , q ′ 3 } AGR
{q 2 , q 5 , q ′ 2 } P ERS
NUM
{q 7 }
◮ (Q ∪ Q ′ )/ ⊲⊳ = {{q 0 , q ′ 0 }, {q 1, q ′ 1 }, {q 4, q ′ 3 }, {q 2, q 5 , q ′ 2 }, {q 3, q 6 }, {q 7 }}
◮ [r] ⊲⊳ = {q 0 , q ′ 0 }
◮ θ = {{q 0 , q ′ 0 } → predicate, {q 1, q ′ 1 } → noun, {q 4, q ′ 3 } →
verb, {q 2 , q 5 , q ′ 2 } → agreement, {q 3, q 6 } → 3rd, {q 7 } → singular}
◮ δ = {(SUBJ, {q 0 , q ′ 0 }) → {q 1, q ′ 1 }, (P RED, {q 0, q ′ 0 }) →
{q 4 , q ′ 3 }, (AGR, {q 1, q ′ 1 }) → {q 2, q 5 , q ′ 2 }, (P ERS, {q 2, q 5 , q ′ 2 }) →
{q 3 , q 6 }, (AGR, {q 4 , q ′ 3 }) → {q 2, q 5 , q ′ 2 }, (NUM, {q 2, q 5 , q ′ 2 }) → {q 7}
Weiwei Sun Head-driven Phrase Structure Grammar I 39/61