Each file begins with a simple declaration of what package it belongs to, and each file can import the packages it USES.
每个文件开头都会声明它属于哪一个包,每个文件也可以引入它所用到的包。
If a source file has a namespace declaration, then all references to classes, functions, and constants use the namespace semantics.
如果源代码文件中有名称空间声明,那么对类、函数和常量的所有引用都使用名称空间语义。
To learn which content elements are specialized by a domain, you can look at the entity declaration file for the domain.
要了解域专门化了哪些内容元素,您可以查看该域的实体声明文件。
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