```ruby
require "xmlrpc/client"
require "nokogiri/xml/sax/document"
require "nokogiri/xml/sax/parser"

class NokogiriStreamParser < XMLRPC::XMLParser::AbstractStreamParser
  def initialize
    @parser_class = Class.new(Nokogiri::XML::SAX::Document) do

      include XMLRPC::XMLParser::StreamParserMixin

      alias_method :start_element, :startElement
      alias_method :end_element,   :endElement
      alias_method :characters,    :character
      alias_method :cdata_block,   :character

      def parse(str)
        Nokogiri::XML::SAX::Parser.new(self).parse(str)
      end
    end
  end
end
```

Add missing namespace to NokogiriStreamParser
user
```ruby
require "xmlrpc/client"
require "nokogiri/xml/sax/document"
require "nokogiri/xml/sax/parser"

module Fog
  module XenServer
    class NokogiriStreamParser < XMLRPC::XMLParser::AbstractStreamParser
      def initialize
        @parser_class = Class.new(Nokogiri::XML::SAX::Document) do

          include XMLRPC::XMLParser::StreamParserMixin

          alias_method :start_element, :startElement
          alias_method :end_element,   :endElement
          alias_method :characters,    :character
          alias_method :cdata_block,   :character

          def parse(str)
            Nokogiri::XML::SAX::Parser.new(self).parse(str)
          end
        end
      end
    end
  end
end
```
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