Common superclass for several types of nodes in the parse tree. Provides
APIs for optimization of evaluation of expressions. Specifically, an
expression only needs to executed once during the evaluation of an xpath
if that expression is context-independent. Expression.isContextDependent()
provides that hint.
author: Dmitri Plotnikov version: $Revision: 1.10 $ $Date: 2004/02/29 14:17:38 $
Inner Class :public static class PointerIterator implements Iterator
Inner Class :public static class ValueIterator implements Iterator