title: not able to extract content from span using scrapy
body: <p>I want to extract the product code from the site <a href="http://www.firstcry.com/morisons-baby-dreams/morisons-baby-dreams-soother-nipple/234227/product-detail" rel="nofollow">http://www.firstcry.com/morisons-baby-dreams/morisons-baby-dreams-soother-nipple/234227/product-detail</a> using x-path:</p>
  
  <pre><code>     item['pcode'] = ' '.join(hxs.select('//*[@id="disp_proid"]/text()').extract()).strip()
  </code></pre>
  
  <p>But I'm getting the null value.</p>