From: "Matthias S." <mstumpp@...>
Date: 2011-02-10T05:40:27+09:00
Subject: Re: Best practice to create a JSON string of one object containing an array of other objects using R

@Brian: Both approaches you proposed result in IOError exception in 
class A, saying to_json "not opened for reading".

Besides adding a class attribute, both approaches are actually similar 
to the second I mentioned...

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