@class NSString, PGGraphFeatureNodeCollection; @interface PGGraphOverTheYearsNodeCollection : PGGraphNodeCollection <PGAssetCollectionFeatureNodeCollection> @property (readonly, nonatomic) PGGraphFeatureNodeCollection *featureNodeCollection; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; + (Class)nodeClass; @end