json_schema: {
      "$schema": "http://json-schema.org/draft-06/schema#",
      "type": "object",
      "properties": {
          "title": {
              "type": "string"
          },
          "description": {
              "type": [
                  "string"
              ]
          },
          "sources": {
              "type": "array",
              "minLength": 1,
              "items": {
                  "type": "object",
                  "properties": {
                      "url": {
                          "type": "string"
                      },
                      "encoding": {
                          "type": "string"
                      }
                  },
                  "required": [
                      "url"
                  ]
              }
          },
          "fields": {
              "type": "array",
              "items": {
                  "type": "object",
                  "properties": {
                      "header": {
                          "type": "string"
                      },
                      "aliases": {
                          "type": "array",
                          "items": {
                              "type": "string"
                          }
                      },
                      "columnType": {
                          "type": "string"
                      },
                      "options": {
                          "type": "object"
                      }
                  }
              }
          },
          "postprocessing": {
              "type": "array",
              "items": {
                  "type": "object",
                  "properties": {
                      "processor": {
                          "type": "string"
                      },
                      "parameters": {
                          "type": "object"
                      }
                  },
                  "required": [
                      "processor"
                  ]
              }
          }
      },
      "required": [
          "title",
          "sources",
          "fields"
      ]
  }