Confusing code examples

[graywolf]

In code examples for (eg. for ArrayCollection) should be whole codes, because this is pretty confusing. I am new to Doctrine2, so I may get it wrong (because it is confusing ;) ), but as I understand, there should be whole code from previous examples, but actual look of tutorial makes me think to delete previous code and replace it with ONLY the new code...

Did I make myself clear or was I confusing? :)