gistfile1.rb

require "rubygems"
gem "libxml-ruby", "1.1.2"
require "libxml"

file = File.join(File.dirname(__FILE__),"..","data","entities.xml")
reader = LibXML::XML::Reader.file(file)

def read_next(reader)
  while reader.read
    if (reader.name == "Header" || reader.name == "Product") && reader.node_type == LibXML::XML::Reader::TYPE_ELEMENT
      str = reader.read_outer_xml
      reader.next_sibling
      return str
    end
  end
end

while str = read_next(reader)
  puts str
end