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The following features are used to ensure the appropriate distribution
of complementizers:
comp
,
possible values: that, if, whether, for, rel, inf_nil, ind_nil, nil
assign-comp
,
possible values: that, if, whether, for, ecm, rel, ind_nil, inf_nil, none
mode
,
possible values: ind, inf, sbjnct, ger, base, ppart, nom, prep
wh
,
possible values: +, -
The value of the
comp
feature tells us what complementizer we
are dealing with. The trees which introduce complementizers come
specified from the lexicon with their
comp
feature and
assign-comp
feature. The
comp
of the Comp tree regulates
what kind of tree goes above the Comp tree, while the
assign-comp
feature regulates what kind of tree
goes below.
e.g.
the following equations are used for that:
(540)0(540
- (541)
- Sc.b:
comp
Comp.t:
comp
(541)0(541
- (542)
- Sc.b:
wh
Comp.t:
wh
(542)0(542
- (543)
- Sc.b:
mode
ind/sbjnct
(543)0(543
- (544)
- Sr.t:
assign-comp
Comp.t:
comp
(544)0(544
- (545)
- Sr.b:
comp
nil
By specifying Sr.b:
comp
nil, we ensure that
complementizers do not adjoin onto other complementizers. The root node
of a complementizer tree always has its
comp
feature
set to a value other than nil.
Trees that take clausal complements specify with the
comp
feature
on their foot node what kind of complementizer(s) they can take.
The
assign-comp
feature of an S node is determined
by the highest VP below the S node and the syntactic configuration
the S node is in.
Next: Verbs with object sentential
Up: Features
Previous: Relative Clauses
XTAG Project
1998-09-14