date.proto

syntax = "proto3";

message Date {
  // Year of date. Must be from 1 to 9999, or 0 if specifying a date without
  // a year.
  int32 year = 1;

  // Month of year. Must be from 1 to 12.
  int32 month = 2;

  // Day of month. Must be from 1 to 31 and valid for the year and month, or 0
  // if specifying a year/month where the day is not significant.
  int32 day = 3;
}

person-with-imports.proto

// The syntax for this file is proto3
syntax = "proto3";

import "my-root-project-directory/date.proto";

/* Person is used to identify users
 * across our system */
message Person {
  // the age as of the person's creation
  int32 age = 1;
  // the first name as documented in the signup form
  string first_name = 2;
  string last_name = 3; // last name as documented in the signup form
  // small_picture represents a small .jpg file
  bytes small_picture = 4;
  bool is_profile_verified = 5;
  // height of the person in cms
  float height = 6;

  // a list of phone numbers that is optional to provide at signup
  repeated string phone_numbers = 7;

  // we currently consider only 4 eye colours
  enum EyeColour {
    UNKNOWN_EYE_COLOUR = 0;
    EYE_GREEN = 1;
    EYE_BROWN = 2;
    EYE_BLUE = 3;
    EYE_GRAY = 4;
  }

  // it's an enum as defined above
  EyeColour eye_colour = 8;

  // Person's birthday
  Date birthday = 9;
}