之前根据《Bible》里的代码，在PPGallery的源代码里面加入直接生成XML对象的代码。但是遇到一个错误：

1026: Constructor functions must be instance methods.

后来在Adobe的网站里找到一个例子：

package { import flash.display.Sprite; public class XmlExample extends Sprite { public function XmlExample() { var employees:XML = <employees> <employee ssn="123-123-1234"> <name first="John" last="Doe"/> <address> <street>11 Main St.</street> <city>San Francisco</city> <state>CA</state> <zip>98765</zip> </address> </employee> <employee ssn="789-789-7890"> <name first="Mary" last="Roe"/> <address> <street>99 Broad St.</street> <city>Newton</city> <state>MA</state> <zip>01234</zip> </address> </employee> </employees>; trace(employees.employee[0].address.zip); // 98765 trace(employees.employee[1].@ssn); // 789-789-7890 trace(employees.employee.name); // <name first="John" last="Doe"/> // <name first="Mary" last="Roe"/> trace(employees..zip[0]); // 98765 trace(employees..@ssn[1]); // 789-789-7890 trace(employees..name); // <name first="John" last="Doe"/> // <name first="Mary" last="Roe"/> trace(employees.employee[0].address.*); // <street>11 Main St.</street> // <city>San Francisco</city> // <state>CA</state> // <zip>98765</zip> var node:String = "zip"; trace(employees.employee[0].address[node]); // 98765 var attribute:String = "ssn"; trace(employees.employee[1].@[attribute]); // 789-789-7890 for each (var num:XML in employees..@ssn) { trace(num); // 123-123-1234 } // 789-789-7890 var ssnToFind:String = "789-789-7890"; trace(employees.employee.(@ssn == ssnToFind).toXMLString()); // <employee ssn="789-789-7890"> // <name first="Mary" last="Roe"/> // <address> // <street>99 Broad St.</street> // <city>Newton</city> // <state>MA</state> // <zip>01234</zip> // </address> // </employee> } } } 

将其加进去仍然有错误，后来才发现原来是XML对象的名字PPGallery和类名相同了。

另外发现，trace语句不能够放在类定义里函数定义之外的地方。