Bug 294303 [Markers] 'Queuing Viewer Updates' in Problems view
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
/**
	 * The Markers View Update Job Family
	 * @since 3.6
	 */
	public final Object MARKERSVIEW_UPDATE_JOB_FAMILY = new Object();
	private static int instanceCount = 1;
	private static final String TAG_GENERATOR = "markerContentGenerator"; 
	private static final String MARKER_FIELD = "MARKER_FIELD"; 
	private static final String TAG_EXPANDED = "expanded"; 
	private static final String TAG_CATEGORY = "category";