Bug 317405 [Model] HandledItem should be abstract
Looks like an oversight the only real types are HandledMenuItem and HandledToolItem.
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/menu/impl/MenuPackageImpl.java
* <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int DIRECT_MENU_ITEM_FEATURE_COUNT = MENU_ITEM_FEATURE_COUNT + 3;
	/**
	 * The meta object id for the '{@link org.eclipse.e4.ui.model.application.ui.menu.impl.HandledMenuItemImpl <em>Handled Menu Item</em>}' class.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see org.eclipse.e4.ui.model.application.ui.menu.impl.HandledMenuItemImpl
	 * @see org.eclipse.e4.ui.model.application.ui.menu.impl.MenuPackageImpl#getHandledMenuItem()
	 * @generated
	 */
	public static final int HANDLED_MENU_ITEM = 9;
	/**
	 * The feature id for the '<em><b>Element Id</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int HANDLED_MENU_ITEM__ELEMENT_ID = MENU_ITEM__ELEMENT_ID;
	/**
	 * The feature id for the '<em><b>Tags</b></em>' attribute list.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int HANDLED_MENU_ITEM__TAGS = MENU_ITEM__TAGS;