{
 "fieldGroups": [
  {
   "name": "location",
   "restrictive": true,
   "fields": [
    "site",
    "unit"
   ]
  },
  {
   "name": "spek",
   "restrictive": true,
   "fields": [
    "jenis",
    "ukuran"
   ]
  }
 ]
}