ALAssetRepresentation
An ALAssetRepresentation object encapsulates one of the representations of a given Alasset object.
Declaration
@interface ALAssetRepresentation : NSObjectOverview
A given asset in the library may have more than one representation. For example, if a camera provides RAW and JPEG versions of an image, the resulting asset will have two representations—one for the RAW file and one for the JPEG file.