{
  "spans": [
    {
      "id": "43c5b8dd-fdeb-48e6-a0a1-809d7244b019", //can be any alphanumric string except for 0 or null. Length does not matter but ID's need to be unique.
      "tokens": [
        {
          "text": "low", // Text for the given token.
          "startIdx": 0, // Start character index for the given token.
          "endIdx": 3 // End character index for the given token.
        }
      ],
      "annotated_by": "machine", // Required for pretokenized text, leave as is.
      "parent": null, // For pretokenized text, this should be null. Could be used in the future if you wanted to pass machine predictions for verification.
      "children": [], // For pretokenized text, leave blank but key needs to exist.Could be used in the future if you wanted to pass machine predictions for verification.
      "classnames": [] // For pretokenized text, leave blank but key needs to exist. Could be used in the future if you wanted to pass machine predictions for verification.
    },
    {
      "id": "02572682-8031-4b61-90e7-b33035c83534",
      "tokens": [
        {
          "text": "calorie",
          "startIdx": 4,
          "endIdx": 11
        }
      ],
      "annotated_by": "machine",
      "parent": null,
      "children": [],
      "classnames": []
    },
    {
      "id": "2741c877-f403-4589-85ec-e29ffdecc265",
      "tokens": [
        {
          "text": "protein",
          "startIdx": 12,
          "endIdx": 19
        }
      ],
      "annotated_by": "machine",
      "parent": null,
      "children": [],
      "classnames": []
    },
    {
      "id": "9ec88423-ec3c-4e77-9724-5c82da531941",
      "tokens": [
        {
          "text": "bar",
          "startIdx": 20,
          "endIdx": 23
        }
      ],
      "annotated_by": "machine",
      "parent": null,
      "children": [],
      "classnames": []
    }
  ],
  "tokens": [
    {
      "text": "low",
      "startIdx": 0,
      "endIdx": 3
    },
    {
      "text": "calorie",
      "startIdx": 4,
      "endIdx": 11
    },
    {
      "text": "protein",
      "startIdx": 12,
      "endIdx": 19
    },
    {
      "text": "bar",
      "startIdx": 20,
      "endIdx": 23
    }
  ],
  "text": "low calorie protein bar" // Full text passage for given unit.
}