System/Library/PrivateFrameworks/ContentKit.framework

WFFolderContentItem.h

NSObject
>
WFContentItem
>
WFGenericFileContentItem

@interface WFFolderContentItem : WFGenericFileContentItem

+ (id)typeDescription;
+ (id)contentCategories;
+ (id)countDescription;
+ (id)ownedTypes;
+ (id)pluralTypeDescription;
+ (id)propertyBuilders;

- (id)defaultSourceForRepresentation:(id)a0;

@end