让我们回顾清单1中的XML结构，并添加一个表示余额信息的简单原型。
Let's revisit the XML structure from Listing 1 and add a simple archetype that represents balance information.
清单3所示的几行php代码的作用就是寻找余额。
Listing 3 shows a few lines of PHP code that simply ask for the balance.
例如，当必须确定要检索的帐户余额时，从用户资产清单检索帐户余额就是有准备的服务。
For example, the retrieval of an account balance from a user portfolio would be a provisioned service, as the account balance to retrieve must be determined.
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