The attribute to return.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string Attribute { get; set; }
 Remarks
 Remarks
            Valid values are
            "instanceType", "kernel", "ramdisk", "userData",
            "disableApiTermination", "instanceInitiatedShutdownBehavior",
            "sourceDestCheck", "groupSet",
            "rootDeviceName", "blockDeviceMapping", "productCodes" and "ebsOptimized"