title: How to specify multiple column by xpath
body: <p>I want to get multiple table data from HTML like this:</p>
  
  <pre><code>html = &lt;&lt;EOF
  &lt;table&gt;
    &lt;tr&gt;
      &lt;td&gt;1&lt;/td&gt;
      &lt;td&gt;2&lt;/td&gt;
      &lt;td&gt;3&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td&gt;4&lt;/td&gt;
      &lt;td&gt;5&lt;/td&gt;
      &lt;td&gt;6&lt;/td&gt;
    &lt;/tr&gt;
  &lt;/table&gt;
  EOF
  </code></pre>
  
  <p>I want to get two data from it like:</p>
  
  <pre><code>noko = Nokogiri::HTML(html)
  noko.xpath("//tr[1]/td[2]").text #=&gt; "2"
  noko.xpath("//tr[1]/td[3]").text #=&gt; "3"
  </code></pre>
  
  <p>What I expect from this code was "23", but it return "123".
  How can I get only "23" by using xpath?</p>
  
  <pre><code>noko.xpath("//tr[1]/td[2 and 3]").text
  </code></pre>