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The XTAG analysis now has two different ways of introducing a
complementizer like that or for, depending upon whether
it occurs in a relative clause or in sentential complementation.
Relative clause complementizers substitute in (using the
tree Comp), while sentential complementizers adjoin in
(using the tree COMPs). Cases like ((208)) where
both kinds of complementizers illicitly occur together are blocked.
- *the book [w<<14161>>i [that [that [Muriel wrote i]]]]
This is accomplished by setting the Sr.t:<comp> feature
in the relative clause tree to nil. The Sr.t:<comp>
feature of the auxiliary tree that introduces
(the sentential complementation) that is set to
that. This leads to a feature clash ruling out ((208)). On the
other hand, if a sentential complement taking verb is adjoined
in at Sr, this feature clash goes away (cf. (209)).
- the book [w<<14172>>i [that Beth thinks [that [Muriel wrote i]]]]