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 -->
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		 * @generated
		 */
		public static final EAttribute UI_ELEMENT__CONTAINER_DATA = eINSTANCE.getUIElement_ContainerData();
		/**
		 * The meta object literal for the '<em><b>Cur Shared Ref</b></em>' reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public static final EReference UI_ELEMENT__CUR_SHARED_REF = eINSTANCE.getUIElement_CurSharedRef();
		/**
		 * The meta object literal for the '<em><b>Visible When</b></em>' containment reference feature.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @generated
		 */
		public static final EReference UI_ELEMENT__VISIBLE_WHEN = eINSTANCE.getUIElement_VisibleWhen();
		/**
		 * The meta object literal for the '{@link org.eclipse.e4.ui.model.application.ui.impl.UILabelImpl <em>UI Label</em>}' class.
		 * <!-- begin-user-doc -->
		 * <!-- end-user-doc -->
		 * @see org.eclipse.e4.ui.model.application.ui.impl.UILabelImpl
		 * @see org.eclipse.e4.ui.model.application.ui.impl.UiPackageImpl#getUILabel()
		 * @generated
		 */
		public static final EClass UI_LABEL = eINSTANCE.getUILabel();
		/**
		 * The meta object literal for the '<em><b>Label</b></em>' attribute feature.