title: Nokogiri separation tag
body: <p><strong>I have to tag a separation by <code>-</code></strong></p>
  
  <p><strong>Example:</strong></p>
  
  <pre><code>require 'nokogiri'
  teste = Nokogiri::XML::DocumentFragment.parse("")
  
  Nokogiri::XML::Builder.with(teste) do |x|
    x.root('xmlns:ns3' =&gt; 'Example namespace') do
      x['ns3'].example "Example Test"
    end
  end
  puts teste.to_xml
  </code></pre>
  
  <p><strong>Output</strong></p>
  
  <pre><code>&lt;exemplo&gt;teste xml&lt;/exemplo&gt;
  </code></pre>
  
  <p><strong>Required output</strong></p>
  
  <pre><code>&lt;ns3:exemplo-teste&gt;teste&lt;/ns3:exemplo-teste&gt;
  </code></pre>