The KEYWORD package contains symbols, called keywords_1, that are typically used as special markers in programs and their associated data expressions_1.
Symbol tokens that start with a package marker are parsed by the Lisp reader as symbols in the KEYWORD package; see section 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 keywords_1 to name the corresponding arguments; see section Ordinary Lambda Lists.
Symbols in the KEYWORD package are, by definition, of type keyword.
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