docs: function Scheme(title) {
          this.title = utils.isUndefined(title) ? "" : title;
  
          // Set the defaults.
          this.description = null;
          this.useExternalValidation = true;
          this.useSingleInstance = false;
          this.streamingMode = Scheme.streamingModeXML;
  
          // List of Argument objects, each to be represented by an <arg> tag.
          this.args = [];
      }