json_schema: {
      "id": "http://schemas.triniti.io/json-schema/triniti/canvas/mixin/image-block/1-0-0.json#",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "etag": {
              "type": "string",
              "pattern": "^[\\w\\.:-]+$",
              "pbj": {
                  "type": "string",
                  "rule": "single"
              }
          },
          "css_class": {
              "type": "string",
              "pattern": "^[\\w\\s-]+$",
              "description": "In rendering environments that support HTML the css_class can be appended to the dom elements' class attribute.",
              "pbj": {
                  "type": "string",
                  "rule": "single"
              }
          },
          "updated_date": {
              "type": "string",
              "format": "date-time",
              "description": "Represents an update that occurred on the node this block is attached to. DOES NOT indicate an update to the block itself. eg an article with a twitter block with updated_date means that the article was updated to include that twitter block.",
              "pbj": {
                  "type": "date-time",
                  "rule": "single"
              }
          },
          "aside": {
              "type": "boolean",
              "description": "When true it means this block represents a portion of a document whose content is only indirectly related to the document's main content. Asides are frequently presented as sidebars or call-out boxes.",
              "pbj": {
                  "type": "boolean",
                  "rule": "single"
              }
          },
          "node_ref": {
              "type": "string",
              "pattern": "^[\\w\\/\\.:-]+$",
              "pbj": {
                  "type": "identifier",
                  "rule": "single"
              }
          },
          "title": {
              "type": "string",
              "minLength": 0,
              "maxLength": 255,
              "description": "An optional override for the title of the node.",
              "pbj": {
                  "type": "string",
                  "rule": "single"
              }
          },
          "caption": {
              "type": "string",
              "minLength": 0,
              "maxLength": 5000,
              "pbj": {
                  "type": "text",
                  "rule": "single"
              }
          },
          "is_nsfw": {
              "type": "boolean",
              "pbj": {
                  "type": "boolean",
                  "rule": "single"
              }
          },
          "url": {
              "type": "string",
              "pattern": "^(https?:\\/\\/)?([\\da-z\\.-]+)\\.([a-z\\.]{2,6})([\\/\\w \\.-]*)*\\/?$",
              "pbj": {
                  "type": "text",
                  "rule": "single",
                  "format": "url"
              }
          },
          "aspect_ratio": {
              "type": "string",
              "enum": [
                  "unknown",
                  "auto",
                  "1by1",
                  "2by3",
                  "3by2",
                  "3by4",
                  "4by3",
                  "4by5",
                  "5by4",
                  "9by16",
                  "16by9",
                  "original",
                  "custom"
              ],
              "pbj": {
                  "type": "string-enum",
                  "rule": "single"
              }
          },
          "fallback_src_url": {
              "type": "string",
              "pattern": "^(https?:\\/\\/)?([\\da-z\\.-]+)\\.([a-z\\.]{2,6})([\\/\\w \\.-]*)*\\/?$",
              "description": "For imported image blocks it may be necessary to store the old URL.",
              "pbj": {
                  "type": "text",
                  "rule": "single",
                  "format": "url"
              }
          }
      },
      "required": [
          "node_ref"
      ],
      "additionalProperties": true
  }