GMSDatasetFeatureLayer
@interface GMSDatasetFeatureLayer : GMSFeatureLayer <GMSDatasetFeature *>An interface representing a feature layer for a dataset.
The featureType of a GMSDatasetFeatureLayer will always be GMSFeatureTypeDataset.
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                  ID of the dataset. DeclarationSwift var datasetID: String! { get }Objective-C @property (nonatomic, readonly) NSString *datasetID;