json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "https://raw.githubusercontent.com/washingtonpost/ans-schema/master/src/main/resources/schema/ans/0.10.5/traits/trait_block_properties.json",
      "title": "Block properties",
      "description": "Block properties for style formatting content elements",
      "type": "object",
      "properties": {
          "dropcap": {
              "title": "Dropcap",
              "description": "Style the first letter of the first word with a dropcap",
              "type": "string",
              "enum": [
                  "letter"
              ]
          }
      }
  }