title: XPath YQL get only specific columns
body: <p>Hi I have a html page that I want to query/"scrape" using YQL. 
  I want to get only four columns text from the table tag on that html page and I don't know how to represent that using XPath. </p>
  
  <p>I located one of the cells by right clicking the cell in Chrome, inspect element and copy xpath and This is the result I got for only that cell. </p>
  
  <pre><code>//*[@id="partsTable"]/tbody/tr[1]/td[8]/text()
  </code></pre>
  
  <p>So that is the expression for the 1st row and the 8th column. 
  Actually, I want to get all the rows for the content in the 5,6,8,9 columns. I don't know if it would be possible to write that in XPath easily. </p>
  
  <p>Thanks a lot for the help. (I am absolutely new to XPath so explanation would be appreciated)</p>