         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()
     }

    
    /// 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]?

        extractedMetadata = try? json.getString(at: "extracted_metadata", "title")
        html = try? json.getString(at: "html")
        text = try? json.getString(at: "text")
        blekko = try? json.decode(at: "blekko", type: BlekkoResult.self)
        language = try? json.getString(at: "language")
        alchemyapiText = try? json.getString(at: "alchemyapi_text")
