Define and improve YFK package specification.
定义和改进包装设计规范。
Oracle packages consist of two main components: package specification and package body.
Oracle 包由两个主要部分组成：包规范说明和包主体。
The variables declared in the package specification are called global variables or public variables.
包规范说明中声明的变量称作全局变量，或公共变量。
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