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Although we explicitly do not want to model semantics in the XTAG grammar,
there is some work along the syntax/semantics interface that would help reduce
syntactic ambiguity and thus decrease the number of semantically anomalous
parses. In particular, verb selectional restrictions, particularly for PP
arguments and adjuncts, would be quite useful. With the exception of the
required to in the Ditransitive with PP Shift tree family (Tnx0Vnx1Pnx2),
any preposition is allowed in the tree families that have prepositions as their
arguments. In addition, there are no restrictions as to which prepositions are
allowed to adjoin onto a given verb. The sentences in ((558))-((560)) are
all currently accepted by the XTAG grammar. Their violations are stronger than
would be expected from purely semantic violations, however, and the presence of
verb selectional restrictions on PP's would keep these sentences from being
- #survivors walked of the street .
- #The man about the earthquake survived .
- #The president arranged on a meeting .