json_schema: {
      "id": "http://schemas.triniti.io/json-schema/triniti/canvas/mixin/block/1-0-1.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"
              }
          }
      },
      "additionalProperties": true
  }