System/Library/PrivateFrameworks/WorkflowKit.framework

WFDeviceCapabilityResource.h

NSObject
>
WFResource

@interface WFDeviceCapabilityResource : WFResource

+ (BOOL)mustBeAvailableForDisplay;

- (BOOL)isMobileGestaltBasedCapability;
- (void)refreshAvailability;
- (id)unavailableResourceError;

@end