use vars qw( @EXPORT @EXPORT_OK %EXPORT_TAGS );
@EXPORT = ();
@EXPORT_OK = qw( foo bar baz );
%EXPORT_TAGS = ( all   => [qw( foo bar baz )],
                 nobaz => [qw( foo bar )],
                 nobar => [qw( foo baz )],
                 nofoo => [qw( bar baz )],
                );