json_schema: {
      "definitions": {
          "builder": {
              "allOf": [
                  {
                      "properties": {
                          "description": {
                              "description": "Builder description.",
                              "type": "string"
                          },
                          "schema": {
                              "description": "Schema for builder option validation.",
                              "type": "string"
                          }
                      },
                      "required": [
                          "schema",
                          "description"
                      ]
                  },
                  {
                      "anyOf": [
                          {
                              "properties": {
                                  "implementation": {
                                      "description": "The next generation builder module.",
                                      "type": "string"
                                  }
                              },
                              "required": [
                                  "implementation"
                              ]
                          },
                          {
                              "properties": {
                                  "class": {
                                      "description": "The builder class module.",
                                      "type": "string"
                                  }
                              },
                              "required": [
                                  "class"
                              ]
                          }
                      ]
                  }
              ],
              "description": "Target options for Builders.",
              "type": "object"
          }
      },
      "properties": {
          "$schema": {
              "description": "Link to schema.",
              "type": "string"
          },
          "builders": {
              "additionalProperties": {
                  "$ref": "#/definitions/builder"
              },
              "type": "object"
          }
      },
      "required": [
          "builders"
      ],
      "title": "Builders schema for validating a list of builders.",
      "type": "object"
  }