For someone with no background in this product, these examples do not reconcile with documentation - e.g. entitymanager seems to be base of doctrine usage but there is no bootstrap.php? May be it is called something else and we are too green to realize it.
More importantly, by its nature ONote is a standalone entity. That gives the impression that this is yet another approach to put an OO layer around database table although the tool is geared towards business objects.