code: function (a, lineNumber, classpath) {
              if (a === undefined || a === null) {
                  this.$logWarn(this.VAR_NULL_OR_UNDEFINED, [lineNumber, classpath]);
              }
              return this._out.write(a);
          }
docs: Write some markup. This method is intended to be called only from the generated code of templates
  (created in aria.templates.ClassGenerator) and never directly from developper code. A call to this method
  is generated for simple text in templates and for ${...} statements.
  @param {String} a Markup to write.
  @param {Number} lineNumber Number of the line in the Template that is writing some markup
  @private
  @implements aria.templates.ITemplate