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many different kinds of relationships can be established between
an anaphor and its antecedent.
Examples are co-reference (``John saw Mary. He''),
part-whole (``John bought a car. The engine''),
and individual-class (``John bought a truck. They
are good for hauling'') (see, for example, ).
The latter two involve bridging
descriptions (see, for example, [7,12,29]):
some reasoning is required to infer the correct
This section presents a set of anaphoric relations
that have good coverage for temporal expressions in
scheduling dialogs (see Section
8.2 for an evaluation).
temporal references involve bridging inferences, in
the sense that
times are calculated by using the antecedent as a frame of reference
or by modifying a previous temporal interpretation.