在这个非常简单的示例中，通过复制当前呈现参数集并只覆盖一个键，就可以计算新的呈现参数集。

In this very simple example it is possible to calculate the new set of render parameters by copying the current set and overriding only one key.

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为了保持示例的简单性，我们只抓取第一个并保存在全局变量中。

To keep the example simple, you only grab the first one and store it in your global variable.

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在下面的示例中，报告作者创建了一个简单列表报告，报告只包含一个投射数据项Year，它使用带有如下caption函数的Year级别。

In the following example, the report author creates a simple list report that contains only a projected data item called Year, which USES the Year level with the caption function as follows.

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