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11 Packages  11.1 Package Concepts 11.1.1 Introduction to Packages 11.1.1.2 Symbols in a Package
11.1.1.2.2 Package Inheritance
Packages can be built up in layers. From one point of view,
a package is a single collection
of mappings from strings into internal symbols and
external symbols.
However, some of these mappings might be established within the package
itself, while other mappings are inherited from other packages
via use-package.
A symbol is said to be present in a package
if the mapping is in the package itself and is
not inherited from somewhere else.
There is no way to inherit the internal symbols of another package;
to refer to an internal symbol using the Lisp reader,
a package containing the symbol
must be made to be the current package,
a package prefix must be used,
or the symbol must be imported into the current package.
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