# File lib/json-schema/validator.rb, line 470
      def json_backend=(backend)
        if defined?(MultiJson)
          backend = backend == 'json' ? 'json_gem' : backend
          MultiJson.respond_to?(:use) ? MultiJson.use(backend) : MultiJson.engine = backend
        else
          backend = backend.to_s
          if @@available_json_backends.include?(backend)
            @@json_backend = backend
          else
            raise JSON::Schema::JsonParseError.new("The JSON backend '#{backend}' could not be found.")
          end
        end
      end