5.1 Definition names

A name introduced by a definition might get its qualifier from one of various sources:

Top-level definitions in a package have the package name as their qualifier
Top-level definitions outside of a package are placed into an anonymous namespace that is unique to the source code file that contains the definitions, which means that such definitions are visible only within that file.
Interface members have the interface name as their qualifier
Dynamic property names have the public namespace as their qualifier
Definitions inside a class have the internal namespace of the current package as their qualifier, unless a namespace attribute is specified
A definition with a namespace attribute has its corresponding namespace as its qualifier
A definition with an access control attribute has the implicitly defined namespace for that access specifier as its qualifier

It is an error to introduce a name with an identifier that has already been defined in an open namespace in the same scope, but with a different qualifier.

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