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Interaction with adjoined Comps

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 $\alpha $Comp), while sentential complementizers adjoin in (using the tree $\beta $COMPs). Cases like ((208)) where both kinds of complementizers illicitly occur together are blocked.
*the book [$\epsilon $w<<14161>>i [that [that [Muriel wrote $\epsilon $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 [$\epsilon $w<<14172>>i [that Beth thinks [that [Muriel wrote $\epsilon $i]]]] 

XTAG Project