Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/INavigatorContentDescriptor.java
String getSuppressedExtensionId();
	/**
	 * @return Returns the overridePolicy or null if this extension does not
	 *         override another extension.
	 * @since 3.4
	 */
	OverridePolicy getOverridePolicy();
	/**
	 * @return The descriptor of the <code>suppressedExtensionId</code> if
	 *         non-null.
	 */
	INavigatorContentDescriptor getOverriddenDescriptor();
	/**
	 * 
	 * Does not force the creation of the set of overriding extensions.
	 * 
	 * @return True if this extension has overriding extensions.
	 */
	boolean hasOverridingExtensions();
	/**
	 * @return The set of overriding extensions (of type
	 *         {@link INavigatorContentDescriptor})
	 */
	Set getOverriddingExtensions();
	/**
	 * @return true if the extension's content provider may adapt to a {@link SaveablesProvider}.
	 */
	boolean hasSaveablesProvider();
}