/// <summary>
/// Checks whether this type instance is using undefined type (a.k.a. <see cref="Variable"/> or <see cref="UserType"/>).
/// </summary>
/// <returns><c>true</c> if this type instance is using undefined type;<c>false</c> otherwise.</returns>
public override bool ContainsUndefinedType()
{
return(ElementType.ContainsUndefinedType());
}