const string HELLO_IN_ENGLISH = "hello!"
const string HELLO_IN_KOREAN = "an-nyoung-ha-se-yo"
const string HELLO_IN_FRENCH = "bonjour!"
const string HELLO_IN_JAPANESE = "konichiwa!"

struct Message {
        1: string name,
        2: optional string lang = "en"
}

service HelloWorld {
    string ping(),
    string sayHello(1:Message msg)
}