saxaphone bug take 2

sax_test2.rb

require 'rubygems'
require 'saxaphone'
require 'stringio'

class Location < Saxaphone::Element
  has_element 'categories', 'Categories' do |element|
    puts "categories element #{element.categories.inspect}"
    attributes['categories'] = element.categories
  end
end

class Categories < Saxaphone::Element
  attr_reader :categories

  has_element 'category', 'Category' do |element|
    puts "category element #{element.category_name}"
    @categories ||= []
    @categories << element.category_name
  end
end

class Category < Saxaphone::Element
  store_attributes %w( name )

  def category_name
    puts "category name #{attributes['name']}"
    attributes['name']
  end
end

xml = StringIO.new %{<?xml version="1.0" encoding="utf-8"?>
  <location>
    <categories>
      <category parentid="1738" parent="Global" nameid="11361" name="MasterCard">
        <group groupid="152" name="Payment Methods"/>
      </category>
      <category parentid="6064" parent="Home Improvement Stores" nameid="6068" name="Hardware"/>
      <category parentid="1434" parent="Outdoor Living Sales" nameid="1436" name="Lawn &amp; Garden Sales"/>
      <category parentid="1534" parent="Tool &amp; Hardware Sales" nameid="1538" name="Lawn &amp; Garden Tool Sales"/>
      <category parentid="1738" parent="Global" nameid="11349" name="Discover">
        <group groupid="152" name="Payment Methods"/>
      </category>
      <category parentid="2000" parent="Tools" nameid="2002" name="Hand Tools"/>
      <category parentid="1987" parent="Home Improvement Stores" nameid="2003" name="Paint"/>
      <category parentid="1738" parent="Global" nameid="11382" name="Visa">
        <group groupid="152" name="Payment Methods"/>
      </category>
      <category parentid="1988" parent="Building Materials" nameid="6024" name="Plumbing Supplies"/>
      <category parentid="1738" parent="Global" nameid="11333" name="American Express">
        <group groupid="152" name="Payment Methods"/>
      </category>
      <category parentid="1987" parent="Home Improvement Stores" nameid="1999" name="Hardware"/>
      <category parentid="1999" parent="Hardware" nameid="2000" name="Tools"/>
    </categories>
  </location>
}

class SubLocation < Location
end

# this produces no output
puts "SubLocation..."
SubLocation.parse(xml)

# this does produce output
puts "Location..."
xml.rewind
#Location.parse(xml)