{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "ledgerVersion",
  "description": "A ledger version number",
  "oneOf": [
    {
      "type": "integer",
      "minimum": 1
    },
    {
      "type": "string",
      "enum": ["validated", "closed", "current"]
    }
  ]
}