Country code enum

UNKNOWN = 0,
AP = 1,
EU = 2,
AD = 3,
AE = 4,
AF = 5,
AG = 6,
AI = 7,
AL = 8,
AM = 9,
CW = 10,
AO = 11,
AQ = 12,
AR = 13,
AS = 14,
AT = 15,
AU = 16,
AW = 17,
AZ = 18,
BA = 19,
BB = 20,
BD = 21,
BE = 22,
BF = 23,
BG = 24,
BH = 25,
BI = 26,
BJ = 27,
BM = 28,
BN = 29,
BO = 30,
BR = 31,
BS = 32,
BT = 33,
BV = 34,
BW = 35,
BY = 36,
BZ = 37,
CA = 38,
CC = 39,
CD = 40,
CF = 41,
CG = 42,
CH = 43,
CI = 44,
CK = 45,
CL = 46,
CM = 47,
CN = 48,
CO = 49,
CR = 50,
CU = 51,
CV = 52,
CX = 53,
CY = 54,
CZ = 55,
DE = 56,
DJ = 57,
DK = 58,
DM = 59,
DO = 60,
DZ = 61,
EC = 62,
EE = 63,
EG = 64,
EH = 65,
ER = 66,
ES = 67,
ET = 68,
FI = 69,
FJ = 70,
FK = 71,
FM = 72,
FO = 73,
FR = 74,
SX = 75,
GA = 76,
GB = 77,
GD = 78,
GE = 79,
GF = 80,
GH = 81,
GI = 82,
GL = 83,
GM = 84,
GN = 85,
GP = 86,
GQ = 87,
GR = 88,
GS = 89,
GT = 90,
GU = 91,
GW = 92,
GY = 93,
HK = 94,
HM = 95,
HN = 96,
HR = 97,
HT = 98,
HU = 99,
ID = 100,
IE = 101,
IL = 102,
IN = 103,
IO = 104,
IQ = 105,
IR = 106,
IS = 107,
IT = 108,
JM = 109,
JO = 110,
JP = 111,
KE = 112,
KG = 113,
KH = 114,
KI = 115,
KM = 116,
KN = 117,
KP = 118,
KR = 119,
KW = 120,
KY = 121,
KZ = 122,
LA = 123,
LB = 124,
LC = 125,
LI = 126,
LK = 127,
LR = 128,
LS = 129,
LT = 130,
LU = 131,
LV = 132,
LY = 133,
MA = 134,
MC = 135,
MD = 136,
MG = 137,
MH = 138,
MK = 139,
ML = 140,
MM = 141,
MN = 142,
MO = 143,
MP = 144,
MQ = 145,
MR = 146,
MS = 147,
MT = 148,
MU = 149,
MV = 150,
MW = 151,
MX = 152,
MY = 153,
MZ = 154,
NA = 155,
NC = 156,
NE = 157,
NF = 158,
NG = 159,
NI = 160,
NL = 161,
NO = 162,
NP = 163,
NR = 164,
NU = 165,
NZ = 166,
OM = 167,
PA = 168,
PE = 169,
PF = 170,
PG = 171,
PH = 172,
PK = 173,
PL = 174,
PM = 175,
PN = 176,
PR = 177,
PS = 178,
PT = 179,
PW = 180,
PY = 181,
QA = 182,
RE = 183,
RO = 184,
RU = 185,
RW = 186,
SA = 187,
SB = 188,
SC = 189,
SD = 190,
SE = 191,
SG = 192,
SH = 193,
SI = 194,
SJ = 195,
SK = 196,
SL = 197,
SM = 198,
SN = 199,
SO = 200,
SR = 201,
ST = 202,
SV = 203,
SY = 204,
SZ = 205,
TC = 206,
TD = 207,
TF = 208,
TG = 209,
TH = 210,
TJ = 211,
TK = 212,
TM = 213,
TN = 214,
TO = 215,
TL = 216,
TR = 217,
TT = 218,
TV = 219,
TW = 220,
TZ = 221,
UA = 222,
UG = 223,
UM = 224,
US = 225,
UY = 226,
UZ = 227,
VA = 228,
VC = 229,
VE = 230,
VG = 231,
VI = 232,
VN = 233,
VU = 234,
WF = 235,
WS = 236,
YE = 237,
YT = 238,
RS = 239,
ZA = 240,
ZM = 241,
ME = 242,
ZW = 243,
A1 = 244,
A2 = 245,
O1 = 249,
AX = 247,
GG = 248,
IM = 249,
JE = 250,
BL = 251,
MF = 252,
BQ = 253,
SS = 254,

Json Schema with Map

{
  "title": "map",
  "type": "object",
  "properties": {},
  "patternProperties": {
    "^[0-9]{1,}$": {
      "type": "integer"
    }
  },
  "additionalProperties": false
}

This code can validate Integer, but cannot check duplicate key.