Defines the way to set Node's property name, by using it's nick instead of default name.
When serialize a class property, by default it uses its name given on class declaration, but is less common to see XML node properties with names like "your_property", but more common is to use "YourProperty". In order to use this kind of names, your implementation should use properties' nick name and override property_use_nick method to return true. This should instruct your code to use this method to use property's nick name. This is the default in GXml default implementations.