The polyadic function package has the form (package S L E1 ... En) where
- S is a symbol beginning in lowercase which is the name of a package; (e.g mypackage).
- L is a list (possibly empty) of non-variable symbols external to the package.
- E1 ... En are a series of Shen expressions.
The Shen reader prepends the package symbol followed by dot before all the lowercase user symbols when evaluating E1 ... En except system symbols and those listed in L
(2-) (package my-stuff [main] a b c append main) my-stuff.a my-stuff.b my-stuff.c append main
Packages are used to enclose programs to avoid name clashes and in macros to generate programs. The function external applied to a package name gves the list of symbols external to that package.