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Case is assigned in the XTAG English grammar by two lexical categories
- verbs and prepositions.4.3 Prepositions assign accusative case (acc) through
their <assign-case> feature, which is linked directly to the <case> feature of their objects.
Figure 4.4(a) shows a lexicalized preposition tree,
while Figure 4.4(b) shows the same tree with the NP
tree from Figure 4.3(a) substituted into the NP
position. Figure 4.4(c) is the tree in
Figure 4.4(b) after unification has taken place.
Note that the case ambiguity of books has been resolved to
Assigning case in prepositional phrases