11 Packages 11.1 Package Concepts 11.1.1 Introduction to Packages 220.127.116.11 Symbols in a Package
18.104.22.168.2 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
However, some of these mappings might be established within the package
itself, while other mappings are inherited from other packages
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.