This abstract class serves as the base for all expression objects. An Expression can be executed to return a {@link com.sun.org.apache.xpath.internal.objects.XObject}, normally has a location within a document or DOM, can send error and warning events, and normally do not hold state and are meant to be immutable once construction has completed. An exception to the immutibility rule is iterators and walkers, which must be cloned in order to be used -- the original must still be immutable.
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