您可以显式地指定字符模式，用以确定如何显示正数、负数、小数和指数。

You can explicitly specify the character pattern for how you want positive, negative, fractional, and exponential Numbers to appear.

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当这个应用程序显示一个约会列表时，它检测那些无效记录的字符串模式，然后跳过它们。

As the application displays a list of appointments, it detects the string pattern of those invalid records and skips them.

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但是，由于模式接受空值作为字符串的有效输入，因此，在表单中字符串类型的元素并不显示为必填的。

However, elements of type string do not appear as mandatory in the form because the schema accepts an empty value as valid input for a string.

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