A package establishes a mapping from names to symbols. At any given time, one package is current. The current package is the one that is the value of *package*. When using the Lisp reader, it is possible to refer to symbols in packages other than the current one through the use of package prefixes in the printed representation of the symbol.
The next figure lists some defined names that are applicable to packages. Where an operator takes an argument that is either a symbol or a list of symbols, an argument of nil is treated as an empty list of symbols. Any package argument may be either a string, a symbol, or a package. If a symbol is supplied, its name will be used as the package name.
*modules* import provide *package* in-package rename-package defpackage intern require do-all-symbols list-all-packages shadow do-external-symbols make-package shadowing-import do-symbols package-name unexport export package-nicknames unintern find-all-symbols package-shadowing-symbols unuse-package find-package package-use-list use-package find-symbol package-used-by-list
Figure 11-1. Some Defined Names related to Packages
220.127.116.11 Package Names and Nicknames
18.104.22.168 Symbols in a Package