Soit le schéma suivant. Quelles instances sont valides ?

{
  "type": "object",
  "properties": {
    "pays": { "type": "string" },
    "cp":   { "type": "string" }
  },
  "if":   { "properties": { "pays": { "const": "FR" } },
            "required": ["pays"] },
  "then": { "required": ["cp"],
            "properties": { "cp": { "pattern": "^[0-9]{5}$" } } }
}