json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "TableData",
      "description": "The data contained in a Table",
      "type": "object",
      "properties": {
          "headers": {
              "type": "array",
              "items": {
                  "type": "string"
              }
          },
          "datasets": {
              "type": "array",
              "items": {
                  "type": "object",
                  "properties": {
                      "row": {
                          "type": "array",
                          "items": {
                              "type": "object",
                              "properties": {
                                  "color": {
                                      "type": "string",
                                      "pattern": "^#[0-9a-fA-F]{6}$"
                                  },
                                  "background": {
                                      "type": "string",
                                      "pattern": "^#[0-9a-fA-F]{6}$"
                                  },
                                  "value": {
                                      "type": "string"
                                  }
                              },
                              "required": [
                                  "value"
                              ]
                          }
                      }
                  }
              }
          }
      },
      "required": [
          "headers",
          "datasets"
      ]
  }