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In our approach,
three types of components - subcategorization frames, blocks and
lexical redistribution rules - are used to describe lexical and
syntactic information.
Actual trees are generated automatically from these abstract descriptions,
as shown in Figure D.1.
In maintaining the grammar only the abstract
descriptions need ever be manipulated; the tree descriptions and the
actual trees which they subsume are computed deterministically from these
high-level descriptions.
- {Lexical Organization: System Overview
XTAG Project
http://www.cis.upenn.edu/~xtag
