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The symmetric (non-peripheral) tree for NP appositives, anchored by:
comma, dash or parentheses. It is shown in Figure 24.1 anchored by
parentheses.
(503)0(503
- (504)
- The music here , Russell Smith's ``Tetrameron '' , sounded good . [Brown:cc09]
(504)0(504
- (505)
- ...cost 2 million pounds (3 million dollars)
(505)0(505
- (506)
- Sen. David Boren (D., Okla.)...
(506)0(506
- (507)
- ...some analysts believe the two recent natural disasters - Hurricane Hugo and the San Francisco earthquake - will carry economic ramifications.... [WSJ]
- {The $\beta$nxPUnxPU tree, anchored by parentheses
The punctuation marks are the anchors and the appositive NP is
substituted. The appositive can be conjoined, but only with a lexical
conjunction (not with a comma). Appositives with commas or dashes
cannot be pronouns, although they may be conjuncts containing
pronouns. When used with
parentheses this tree actually presents an alternative rather than an
appositive, so a pronoun is possible. Finally, the appositive position
is restricted to having nominative or accusative case to block PRO
from appearing here.
Appositives can be embedded, as in ((508)), but do not seem to be
able to stack on a single NP. In this they are more like restrictive
relatives than appositive relatives, which typically can stack.
(507)0(507
- (508)
- ...noted Simon Briscoe, UK economist for Midland Montagu, a unit of Midland Bank PLC.
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XTAG Project
http://www.cis.upenn.edu/~xtag