Macro define_node 

macro_rules! define_node {
    (
        $(#[$meta:meta])*
        $Name:ident $(($WebotsName:literal))? {
            $(
                $(#[$field_meta:meta])*
                $field:ident : $Type:ty
            ),* $(,)?
        }
    ) => { ... };
}

Defines a struct representing a generic Webots node.