JRuby + Xerces

topsongs.rb

# You can download the Xerces jar here:
# http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22xerces%22

require "java"
require "xerces-2.4.0-sources.jar"

url = java.net.URL.new("http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/ws/RSS/topsongs/limit=10/xml")
connection = url.open_connection

builder = javax.xml.parsers.DocumentBuilderFactory.new_instance.new_document_builder
dom     = builder.parse(connection.input_stream)
attributes = dom.document_element.attributes

attributes.length.times do |i|
  node = attributes.item i
  puts "#{node.name}: #{node.value}" 
end