> Is it possible to create a custom protocol?

No.

> Can I change composition repository path to some other path?

No.

> How do I know by looking a composition that it belongs to which protocol? 

-[QCComposition protocols] will return an NSArray with the protocols the 
composition conforms to.  Further details are in the QCComposition Class 
reference, but here are the relevant bits you're likely interested in:

Standard Protocols
Protocols for a composition.

extern NSString* const QCCompositionProtocolGraphicAnimation;
extern NSString* const QCCompositionProtocolGraphicTransition;
extern NSString* const QCCompositionProtocolImageFilter;
extern NSString* const QCCompositionProtocolImageCompositor;
extern NSString* const QCCompositionProtocolImageTransition;
extern NSString* const QCCompositionProtocolScreenSaverRSS;


--
Christopher Wright
christopher_wri...@apple.com



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