Has anyone got any experience using the PubSub framework, specifically the 
PSClientDelegate API? There's no documentation on it whatsoever (except for one 
mention that it exists) (rdar://8395669). Looking in the header file, I see the 
following methods: 

- (void) feedDidBeginRefresh:(PSFeed *)feed;
- (void) feedDidEndRefresh:(PSFeed *)feed;

- (void) feed:(PSFeed *)feed didAddEntries:(NSArray *)entries;
- (void) feed:(PSFeed *)feed didRemoveEntriesWithIdentifiers:(NSArray 
*)identifiers;
- (void) feed:(PSFeed *)feed didUpdateEntries:(NSArray *)entries;
- (void) feed:(PSFeed *)feed didChangeFlagsInEntries:(NSArray *)entries;

- (void) enclosure:(PSEnclosure *)enclosure 
downloadStateDidChange:(PSEnclosureDownloadState)state;

The first two and the last one I can guess at when they're called, but I'm not 
sure about the middle four. 
For that matter, I'm not sure when to use these methods, versus when to 
register for the PSFeedRefreshingNotification, 
PSFeedEntriesChangedNotification, etc. 

Does anyone have guidelines or experience here?

-Daniel

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