当现有资源包含了使用运算式而非简单整数定义符号值的符号定义时，您也可以使用包含的符号档。

You can also use included symbol files when you have existing resources with symbol definitions that use expressions rather than simple integers to define the symbol value.

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由于无法保证规则运算式产生器一定会产生唯一的值，所以您不能使用它来填满具有唯一条件约束的使用者定义型别资料行。

Because the Regular Expression generator is not guaranteed to produce unique values, you cannot use it to fill a user-defined type column that has a unique constraint.

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运算式可以计算值然后显示结果、成为搜寻条件的一部分或结合资料行内容。

Expressions can calculate values to display, be part of search conditions, or combine the contents of data columns.

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