Bug 316298 [Compatibility] Support o.e.ui.menus visibleWhen
We need support in MCoreExpression for entire expressions created by the WorkbenchMenuService. They don't often use ReferenceExpressions to core expression definitions. PW
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/impl/UiPackageImpl.java
* <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public static final EAttribute UI_LABEL__LABEL = eINSTANCE.getUILabel_Label();
		/**
		 * The meta object literal for the '<em><b>Icon URI</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public static final EAttribute UI_LABEL__ICON_URI = eINSTANCE.getUILabel_IconURI();
		/**
		 * The meta object literal for the '<em><b>Tooltip</b></em>' attribute feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public static final EAttribute UI_LABEL__TOOLTIP = eINSTANCE.getUILabel_Tooltip();
		/**
		 * The meta object literal for the '{@link org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl <em>Element Container</em>}' class.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @see org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl
		 * @see org.eclipse.e4.ui.model.application.ui.impl.UiPackageImpl#getElementContainer()
		 * @generated
		 */
		public static final EClass ELEMENT_CONTAINER = eINSTANCE.getElementContainer();
		/**
		 * The meta object literal for the '<em><b>Children</b></em>' containment reference list feature.