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
* @see org.eclipse.e4.ui.model.application.ui.impl.CoreExpressionImpl
	 * @see org.eclipse.e4.ui.model.application.ui.impl.UiPackageImpl#getCoreExpression()
	 * @generated
	 */
	public static final int CORE_EXPRESSION = 10;
	/**
	 * The feature id for the '<em><b>Core Expression Id</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int CORE_EXPRESSION__CORE_EXPRESSION_ID = EXPRESSION_FEATURE_COUNT + 0;
	/**
	 * The number of structural features of the '<em>Core Expression</em>' class.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int CORE_EXPRESSION_FEATURE_COUNT = EXPRESSION_FEATURE_COUNT + 1;
	/**
	 * The meta object id for the '{@link org.eclipse.e4.ui.model.application.ui.SideValue <em>Side Value</em>}' enum.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see org.eclipse.e4.ui.model.application.ui.SideValue
	 * @see org.eclipse.e4.ui.model.application.ui.impl.UiPackageImpl#getSideValue()
	 * @generated
	 */
	public static final int SIDE_VALUE = 11;