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The XTAG system can handle sentences with conjunction of two
constituents of the same syntactic category. The coordinating
conjunctions which select the conjunction trees are and, or and but.21.1
There are also multi-word conjunction trees, anchored by either-or,
neither-nor, both-and, and as well as. There are eight
syntactic categories that can be coordinated, and in each case an
auxiliary tree is used to implement the conjunction. These eight
categories can be considered as four different cases, as described in
the following sections. In all cases the two constituents are
required to be of the same syntactic category, but there may also be
some additional constraints, as described below.
XTAG Project
1998-09-14