SI base units

{
  "id": "SI_base",
  "unitsml_id": "us:si-base",
  "name": "SI base units",
  "short": "si-base",
  "acceptable": true,
  "unit_count": 8,
  "identifiers": [
    {
      "type": "nist",
      "id": "SI_base"
    },
    {
      "type": "unitsml",
      "id": "us:si-base"
    }
  ],
  "base_units": []
}