syntax = "proto3"; package addressbook; message Person { string name = 1; int32 id = 2; // Unique ID number for this person. string email = 3; uint32 age = 4; enum PhoneType { MOBILE = 0; HOME = 1; WORK = 2; } message PhoneNumber { string number = 1; PhoneType type = 2; } repeated PhoneNumber phones = 5; } message AddressBook { repeated Person people = 1; repeated string tags = 2; }