bless REF,CLASSNAME
       bless REF
               This function tells the thingy referenced by REF
               that it is now an object in the CLASSNAME package.
               If CLASSNAME is omitted, the current package is
               used.  Because a "bless" is often the last thing
               in a constructor, it returns the reference for
               convenience.  Always use the two-argument version
               if the function doing the blessing might be inher-
               ited by a derived class.  See perltoot and perlobj
               for more about the blessing (and blessings) of
               objects.

               Consider always blessing objects in CLASSNAMEs
               that are mixed case.  Namespaces with all lower-
               case names are considered reserved for Perl prag-
               mata.  Builtin types have all uppercase names, so
               to prevent confusion, you may wish to avoid such
               package names as well.  Make sure that CLASSNAME
               is a true value.

               See "Perl Modules" in perlmod.