ANSI Common Lisp 11 Packages 11.1 Package Concepts 11.1.2 Standardized Packages
220.127.116.11 The KEYWORD Package
The keyword package contains symbols, called keywords1,
that are typically used as special markers in programs
and their associated data expressions1.
Symbol tokens that start with a package marker
are parsed by the Lisp reader as symbols
in the keyword package; see Section 2.3.4 Symbols as Tokens.
This makes it notationally convenient to use keywords
when communicating between programs in different packages.
For example, the mechanism for passing keyword parameters in a call uses
keywords1 to name the corresponding arguments;
see Section 3.4.1 Ordinary Lambda Lists.
Symbols in the keyword package are, by definition, of type keyword.
18.104.22.168.1 Interning a Symbol in the KEYWORD Package
22.214.171.124.2 Notes about The KEYWORD Package