YAML⇔XML相互変換

gistfile1.rb

require 'active_support/core_ext'
require 'yaml'
require "rexml/document"

# YAML→XML
open('ja.xml', 'w') do |f|
  f.write YAML.load_file('ja.yml').to_xml
end

# XML→YAML
doc = REXML::Document.new(File.new("ja.xml"))
open('ja2.yml', 'w') do |f|
  f.write Hash.from_xml(doc.to_s)['hash'].to_yaml
end