@Target(METHOD) @Retention(RUNTIME) public @interface ToStringAnnotation used to mark a method as being suitable for converting an object to a standard format
This annotation should be applied to one method on a class. The method must not be static. It must take no parameters and return a
String. The string format must be able to be parsed by the matching @FromString on the same class. The format should be human readable and an industry standard where possible, for example ISO-8601 for dates and times.