Metadata handler atom ('hdlr') An atom that defines the structure used for all types of metadata stored within the metadata atom. Mentioned inQuickTime File Format change log OverviewThe metadata handler atom is a full atom with an atom type of ‘hdlr’. It defines the structure used for all types of metadata stored within the metadata atom. TopicsData fieldsSizeTypeVersionFlagsPredefinedHandler typeReservedName See AlsoMetadata structureMetadata atom ('meta')Metadata header atom ('mhdr')