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$node->getArea()->getUri(); and both getArea() and getUri() are part
of the business logic for the record; now the Area will be part of the
record itself :), and getUri() stays in the Area record as part od the
business logic.

For the recorset, I'm thinking that logic could be rules for for
fetchAll() (add WHERE, GROUP BY, perform a COUNT together etc), and if
you need some special logic there, then I think you'll need what I
will call "the third class" (the recordset subclass).

rodrigo