LabLISP Guide

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**//LabLISP packages and symbols//**

Built-in LabLISP operators are represented by symbols from the base package ''LABLISP''.\\
Default package is the ''USER'' package, which inherits all the base package symbols.\\
There is also ''KEYWORD'' package with 3 symbols only: ''INTERNAL'', ''EXTERNAL'', ''INHERITED''.

Symbols ''&OPTIONAL'', ''&REST'', ''&WHOLE'' and ''&BODY'' are sometimes called keywords, but they are symbols interned in base package, and they are not bound to any value.

Packages are not represented by symbols for obvious reasons. They are accessed by the name string. Several more packages are defined through the LabLispHost mechanics.

Apart from the functions and special operators, these symbols are defined and bound:

''NIL'' and ''T'' as constants.

''PI'' = 3.14159, is //not// defined as constant.

''*PACKAGE*'' is the current package.

''*ALLOW-NON-LITERAL-CONST*'' special LabLISP flag, default NIL. 

''*PRINT-SHARED*'' control printing of shared list structure, default NIL.

Following 5 are internal processing flags, default NIL.

''*MACROEXPAND-ONLY*''

''*BACKQUOTE-CONTEXT*''

''*BACKQUOTE-SPLICE*''

''*BACKQUOTE-HARD-SPLICE*''

''*FUNCTOR-EVAL*''