json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "id": "https://raw.githubusercontent.com/washingtonpost/ans-schema/master/src/main/resources/schema/ans/0.5.3/utils/reference.json",
      "title": "Representation of a normalized element",
      "description": "This represents a reference to external content that should be denormalized",
      "properties": {
          "type": {
              "type": "string",
              "enum": [
                  "reference"
              ]
          },
          "referent": {
              "type": "object",
              "properties": {
                  "type": {
                      "description": "The ANS type that the provider should return.",
                      "type": "string"
                  },
                  "service": {
                      "description": "The type of interaction the provider expects. E.g., 'oembed'",
                      "type": "string"
                  },
                  "id": {
                      "description": "The id passed to the provider to retrieve an ANS document",
                      "type": "string"
                  },
                  "provider": {
                      "description": "A URL that can resolve the id into an ANS element",
                      "type": "string"
                  }
              },
              "required": [
                  "provider",
                  "id"
              ]
          }
      },
      "required": [
          "type",
          "referent"
      ]
  }