Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/INavigatorPipelineService.java
* massage further.
	 * </p>
	 * <p>
	 * <b>Clients should not call any of the add, remove, refresh, or update
	 * methods on the viewer from this method or any code invoked by the
	 * implementation of this method.</b>
	 * </p>
	 * 
	 * @param anAddModification
	 *            The shape modification which contains the current suggested
	 *            parent and children. Clients may modify this parameter
	 *            directly and return it as the new shape modification.
	 * @return The new shape modification to use. Clients should <b>never</b>
	 *         return <b>null</b> from this method.
	 */
	public PipelinedShapeModification interceptAdd(
			PipelinedShapeModification anAddModification);
	/**
	 * Intercept attempts to remove elements directly from the viewer.
	 * 
	 * <p>
	 * For content extensions that reshape the structure of children in a
	 * viewer, their overridden extensions may sometimes use optimized refreshes
	 * to remove elements to the tree. These attempts must be intercepted and
	 * mapped to the correct set of model elements in the overriding extension.
	 * Clients may add, remove, or modify elements in the given set of removed
	 * children. Clients should return a set for downstream extensions to
	 * massage further.
	 * </p>
	 * <p>