test.rb

module SuperParsr 
  module Atom
    
    def namespaces
      'http://www.w3.org/2005/Atom'
      #['http://www.w3.org/2005/Atom', 'http://purl.org/atom/ns', 'http://purl.org/atom/ns#']
    end
    
    module Feed

      def self.included(base)
        subs = base.subclass_and_add_parsers_for_classes([::Link, ::Author, ::Entry, ::Category])
        
        base.element  :title,    :xmlns => SuperParsr::Atom.namespaces, :as => :title
        base.element  :updated,  :xmlns => SuperParsr::Atom.namespaces, :as => :updated_as_string
        base.element  :id,       :xmlns => SuperParsr::Atom.namespaces, :as => :feed_id
        base.elements :link,     :xmlns => SuperParsr::Atom.namespaces, :as => :links,           :class => subs[::Link]
        base.elements :author,   :xmlns => SuperParsr::Atom.namespaces, :as => :authors,         :class => subs[::Author]
        base.elements :entry,    :xmlns => SuperParsr::Atom.namespaces, :as => :entries,         :class => subs[::Entry]
        base.elements :category, :xmlns => SuperParsr::Atom.namespaces, :as => :categories,      :class => subs[::Category]
      end

      def self.able_to_parse?(xml) #:nodoc:
        xml =~ /(#{Regexp.escape("http://www.w3.org/2005/Atom")})|(#{Regexp.escape("http://purl.org/atom")})/
      end

    end
  end
end

#<?xml version="1.0" encoding="utf-8"?>
#<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:thr="http://purl.org/syndication/thread/1.0">
    <title>Amazon Web Services Blog</title>
#</feed>