     
     /// Extracted concepts of the document.
     public let concepts: [Concept]?
-    
-    public let keyAsString: String?
     
     /// A list of aggregations provided by the service.
     public let aggregations: [Aggregation]?

        extractedURL = try? json.getString(at: "url")
        title = try? json.getString(at: "title")
        concepts = try? json.decodedArray(at: "concepts", type: Concept.self)
        keyAsString = try? json.getString(at: "key_as_string")
        aggregations = try? json.decodedArray(at: "aggregations", type: Aggregation.self)
        self.json = try json.getDictionaryObject()
    }

    /// Entire text of the document including hyperlinks, url, etc.
    public let text: String?
    
    /// Results of Blekko search engine.
    public let blekko: BlekkoResult?
    
