Key type for TSetin the asset registry. Top level assets are searched for by their asset path as two names (e.g. '/Path/ToPackageName' + 'AssetName') Other assets (e.g. external actors) are searched for by their full path with the whole outer chain as a single name. (e.g. '/Path/To/Package.TopLevel:Subobject' + 'DeeperSubobject')