ConfigSections.cs

    public class DevicesConfigurationSection : ConfigurationSection
    {
        [ConfigurationProperty("devices")]
        [ConfigurationCollection(typeof(DeviceConfigElement), AddItemName = "device", CollectionType = ConfigurationElementCollectionType.BasicMap)]
        public ConfigurationElementCollection<DeviceConfigElement> Devices => base["devices"] as ConfigurationElementCollection<DeviceConfigElement>;
    }
    
    public class DeviceConfigElement : IdentifiableConfigurationElement
    {
        public override string Id => Type;

        [ConfigurationProperty("type")]
        public string Type => base["type"] as string;

        [ConfigurationProperty("touchActivities")]
        [ConfigurationCollection(typeof(TouchActivityConfigElement), AddItemName = "touchActivity", CollectionType = ConfigurationElementCollectionType.BasicMap)]
        public ConfigurationElementCollection<TouchActivityConfigElement> TouchActivities => base["touchActivities"] as ConfigurationElementCollection<TouchActivityConfigElement>;
    }

    public class TouchActivityConfigElement : IdentifiableConfigurationElement
    {
        public override string Id => Type.ToString();

        [ConfigurationProperty("type")]
        public string Type => base["type"].ToString();

        [ConfigurationProperty("points")]
        [ConfigurationCollection(typeof(PointConfigElement), AddItemName = "point", CollectionType = ConfigurationElementCollectionType.BasicMap)]
        public ConfigurationElementCollection<PointConfigElement> Points => base["points"] as ConfigurationElementCollection<PointConfigElement>;
    }    

    public class PointConfigElement : IdentifiableConfigurationElement
    {
        [ConfigurationProperty("x")]
        public int X => (int)base["x"];

        [ConfigurationProperty("y")]
        public int Y => (int)base["y"];

        [ConfigurationProperty("id")]
        public override string Id => base["id"].ToString();
    }