4. Type Specifiers

In Common Lisp types are named by Lisp objects specifically symbols and lists called type specifiers. Symbols name predefined classes of objects whereas lists usually indicate combinations or specializations of simpler types. Symbols or lists may also be abbreviations for types that could be specified in other ways.

Type Specifier Symbols
Type Specifier Lists
Predicating Type Specifiers
Type Specifiers That Combine
Type Specifiers That Specialize
Type Specifiers That Abbreviate
Defining New Type Specifiers
Type Conversion Function
Determining the Type of an Object
Type Upgrading

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