Bug 126658 [CommonNavigator] [DND] Complete definition of DND API
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/INavigatorDnDService.java
/**
	 * 
	 * As part of the <b>org.eclipse.ui.navigator.viewer</b> extension point,
	 * clients may explicit extend the support Transfer Types of a particular
	 * viewer using the <b>dragAssistant</b> element. This element defines a
	 * class which extends {@link CommonDragAdapterAssistant} and can direct the
	 * viewer on how to provide different kinds of DND Transfer Types. The array
	 * is returned in no particular order.
	 * 
	 * 
	 * 
	 * @return An array of {@link CommonDragAdapterAssistant} or an empty array.
	 */
	CommonDragAdapterAssistant[] getCommonDragAssistants();
	/**
	 * 
	 * This method returns an array of {@link CommonDropAdapterAssistant} from
	 * content extensions that are <i>visible</i> and <i>active</i> for the