For some reason, I can't access a class variable inside a Nokogiri block like I can inside Builder blocks.

nokogiri_builder_test.rb

require 'rubygems'
require 'builder' # 2.1.2
require 'nokogiri' # 1.2.1

@testing = { :item1 => 'value1', :item2 => 'value2', :item3 => 'value3' }

def nokogiri
  Nokogiri::XML::Builder.new {
    root {
      items {
        if @testing
          @testing.each_pair do |key, value|
            item { text value }
          end
        end
      }
    }
  }
end

def builder
  xml = Builder::XmlMarkup.new(:indent => 1)
  xml.root {
    xml.items {
      if @testing
        @testing.each_pair do |key, value|
          xml.item value
        end
      end
    }
  }
  xml
end

puts 'Builder:'
puts builder.target!

puts 'Nokogiri:'
puts nokogiri.to_xml

# OUTPUT
# Builder:
# <root>
#  <items>
#   <item>value1</item>
#   <item>value2</item>
#   <item>value3</item>
#  </items>
# </root>
# Nokogiri:
# <?xml version="1.0"?>
# <root>
#   <items/>
# </root>

Same problem here.
Did you find why ?