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An object should not retain its delegate, but what about its data source ?

An object should not retain its delegate.
   
  Should an object retain its data source ?  Do NSBrowser and NSTableView retain their data sources ?
   
  My thinking right now is that a delegate is not essential so the object that has a delegate doesn't "own" the delegate.  However, a data source may be essential in which case the object with a data source does "own" the data source and should retain it.
   
  What is the net wisdom on the subject ?
   
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