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Each of these four categories has an auxiliary tree that is used for
conjunction of two constituents of that category. The auxiliary tree
adjoins into the left-hand-side component, and the right-hand-side
component substitutes into the auxiliary tree.
Figure:
Tree for adjective conjunction: a1CONJa2 and a resulting parse tree
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(a) |
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(b) |
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Figure 21.1(a) shows the auxiliary tree for adjective conjunction,
and is used, for example, in the derivation of the parse tree for the noun
phrase the dark and dreary day, as shown in Figure 21.1(b).
The auxiliary tree adjoins onto the node for the left adjective, and the
right adjective substitutes into the right hand side node of the auxiliary
tree. The analysis for adverb, preposition and PP conjunction is exactly the
same and there is a corresponding auxiliary tree for each of these that is
identical to that of Figure 21.1(a) except, of course, for the node
labels.
Next: Noun Phrase and Noun
Up: Conjunction
Previous: Introduction
XTAG Project
1998-09-14