清单11对第一个文档实例返回出生日期列表，对第二个实例却返回空白列表。

Listing 11 returns a list of birth dates for the first document instance, and an empty list for the second instance.

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在这个阶段，列表中的每个项目都有一个与它关联的空白框架。

At this stage, each item in the list has an empty frame associated with it.

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遇到后跟空白的冒号时分割，假定为列表的开始。

Break after a colon followed by a white space; this is assumed to be the start of a list.

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