Sample program for using xpath with nokogiri

xpath.rb

#!/usr/bin/env ruby

require 'robotex'
require 'nokogiri'
require 'open-uri'

url = 'http://www.cplusplus.com/reference/ios/basic_ios/'
# Fake User Agent
ua = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1'

robotex = Robotex.new
puts robotex.allowed?(url)

charset = 'utf8'
html = open(url, 'User-Agent' => ua)
doc = Nokogiri::HTML::parse(html)

# html = open(url, 'User-Agent' => ua) do |f|
#   charset = f.charset
#   f.read
# end
# doc = Nokogiri::HTML::parse(html, nil, charset)

puts doc.xpath('//*[@id="types"]/dl[4]')
# Can also do something like this
# puts doc.xpath('//*[@id="types"]/dl[*]')