class PoiItemCollection {
    var success: Bool
    var data: [PoiListItem]
    init(success:Bool,data:[PoiListItem]) {
       self.success = success
        self.data = data
    }
}

class PoiListItem {
    var poiId:String
    var poiName:String
    //...
    init(poiId:String,poiName:String) {
        self.poiId = poiId
        self.poiName = poiName
    }
}