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control
has no value and is used only for indexing
purposes. The root node of every clausal tree has its control
feature coindexed with the control feature of
its subject. This allows adjunct control to take place. In addition,
clauses that take infinitival clausal complements have the control feature
of their subject/object coindexed with the control feature of their
complement clause S, depending upon whether they are subject control verbs
or object control verbs respectively.
XTAG Project
http://www.cis.upenn.edu/~xtag