code: private static void appendExtrude(ExtrudeMode extrude, StringBuilder sb) {
          if (extrude.equals(ExtrudeMode.TRUE)) {
              sb.append("<extrude>").append(1).append("</extrude>");
          } else if (extrude.equals(ExtrudeMode.FALSE)) {
              sb.append("<extrude>").append(0).append("</extrude>");
          }
      }
docs: Append the extrude value
  
  Syntax :
  
  <extrude>0</extrude>
  
  @param extrude
  @param sb