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## PUs

Anchored by comma: allows comma-separated clause initial adjuncts, ((527)-(528)).
(526)0(526
(527)
Here , as in Journal'' , Mr. Louis has given himself the lion's share of the dancing... [Brown:cc09]

(527)0(527
(528)
Choreographed by Mr. Nagrin, the work filled the second half of a program

To keep this tree from appearing on root Ss (i.e. , sentence), we have a root constraint that <punct struct = nil> (similar to the requirement that root Ss be tensed, i.e. <mode = ind/imp>). The <punct struct> = nil feature on the foot blocks stacking of multiple punctuation marks. This feature is shown in the tree in Figure 24.8.

{$\beta$PUs, with features displayed

This tree can be also used by adjuncts on embedded clauses:

(528)0(528
(529)
One might expect that in a poetic career of seventy-odd years, some changes in style and method would have occurred, some development taken place. [Brown:cj65]

These adjuncts sometimes have commas on both sides of the adjunct, or, like ((529)), only have them at the end of the adjunct. Finally, this tree is also used for peripheral appositive relative clauses.

(529)0(529
(530)
Interest may remain limited into tomorrow's U.K. trade figures, which the market will be watching closely to see if there is any improvement after disappointing numbers in the previous two months.

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XTAG Project
http://www.cis.upenn.edu/~xtag