json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "image",
      "description": "A image atom",
      "type": "object",
      "properties": {
          "modifier": {
              "description": "A modifier - default is 16:9",
              "enum": [
                  "",
                  "fit-parent",
                  "1x1"
              ]
          },
          "alt": {
              "type": "string"
          },
          "srcset": {
              "type": "object",
              "properties": {
                  "renditions": {
                      "type": "array",
                      "items": {
                          "type": "object",
                          "properties": {
                              "media": {
                                  "description": "sizes",
                                  "enum": [
                                      "100w",
                                      "180w",
                                      "230w",
                                      "290w",
                                      "320w",
                                      "360w",
                                      "460w",
                                      "480w",
                                      "580w",
                                      "640w",
                                      "760w",
                                      "960w",
                                      "1200w",
                                      "1280w",
                                      "1496w",
                                      "1920w",
                                      "1960w",
                                      "2880w",
                                      "3920w"
                                  ]
                              },
                              "src": {
                                  "type": "string"
                              }
                          },
                          "required": [
                              "media",
                              "src"
                          ]
                      }
                  }
              }
          },
          "customRenditions": {
              "type": "object",
              "description": "Custom renditions to render e.g. a fallback or preview image",
              "properties": {
                  "fallbackImage": {
                      "type": "string",
                      "description": "The src to the fallback image to be rendered initially"
                  }
              },
              "required": [
                  "fallbackImage"
              ]
          }
      },
      "required": [
          "alt",
          "srcset"
      ]
  }