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/MCoreExpression.java
/**
	 * Returns the value of the '<em><b>Core Expression Id</b></em>' attribute.
	 * The default value is <code>""</code>.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of the '<em>Core Expression Id</em>' attribute isn't clear,
	 * there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @return the value of the '<em>Core Expression Id</em>' attribute.
	 * @see #setCoreExpressionId(String)
	 * @model default=""
	 * @generated
	 */
	String getCoreExpressionId();
	/**
	 * Sets the value of the '{@link org.eclipse.e4.ui.model.application.ui.MCoreExpression#getCoreExpressionId <em>Core Expression Id</em>}' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @param value the new value of the '<em>Core Expression Id</em>' attribute.
	 * @see #getCoreExpressionId()
	 * @generated
	 */
	void setCoreExpressionId(String value);
}