text: PRANG::Cookbook::Node - Baseclass for nodes in the Cookbook series
  package PRANG::Cookbook::Node; use Moose::Role; #sub xmlns { "" } # no namespaces required (optional) 1;
  This class is just a base class for every node in the Cookbook series. It contains nothing more than what is shown above and just inherits from Moose::Role and provides a convenient place for a global XML namespace to be specified.
  It also overrides the xmlns method to define that these nodes do not have namespaces (as a default). Instead if a node chooses to define what namespace it should be in, it is welcome to override this method too.