* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public NotificationChain basicSetP_expression(ExpressionAst newP_expression, NotificationChain msgs) {
ExpressionAst oldP_expression = p_expression;
p_expression = newP_expression;
if (eNotificationRequired()) {
ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, QvtAstPackage.RETURN_EXP_AST__PEXPRESSION, oldP_expression, newP_expression);
if (msgs == null) msgs = notification; else msgs.add(notification);
}