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- GrlData — Low-level class for storing metadata information about media resources provided by GrlSource objects.
- GrlRelatedKeys — A class where to store related metadata keys.
- GrlMedia — A multimedia data transfer object
- GrlMediaBox — A container for multiple medias
- GrlMediaVideo — A multimedia data for video
- GrlMediaAudio — A multimedia data for audio
- GrlMediaImage — A multimedia data for image