JSON attribute mapping rule with a complex XPath

xpath-rule.js

{
  "mapping": {
    "rules": [
      {
        "remote": [
          {
            "path": "(:\n   If the number of seconds is even, then the role should be\n   nova:admin and lbaas:admin\n\n   Otherwise the roles should be nova:observe and lbaas:observer.\n:)\nif ((xs:integer(seconds-from-time(current-time())) mod 2) = 0)\n      then ('nova:admin','lbaas:admin')\n      else ('nova:observer','lbaas:observer')\n",
            "multiValue": true
          }
        ],
        "local": {
          "user": {
            "domain": "78334",
            "name": "{D}",
            "email": "{D}",
            "roles": "{0}",
            "expire": "{D}"
          }
        }
      }
    ],
    "version": "RAX-1"
  }
}