title: How can I use R (Rcurl/XML packages ?!) to scrape this webpage?
body: <p>I have a (somewhat complex) web scraping challenge that I wish to accomplish and would love for some direction (to whatever level you feel like sharing) here goes:</p>
  
  <p>I would like to go through all the "species pages" present in this link:</p>
  
  <p><a href="http://gtrnadb.ucsc.edu/" rel="nofollow noreferrer">http://gtrnadb.ucsc.edu/</a></p>
  
  <p>So for each of them I will go to:</p>
  
  <ol>
  <li>The species page link (for example: <a href="http://gtrnadb.ucsc.edu/Aero_pern/" rel="nofollow noreferrer">http://gtrnadb.ucsc.edu/Aero_pern/</a>)</li>
  <li>And then to the "Secondary Structures" page link (for example: <a href="http://gtrnadb.ucsc.edu/Aero_pern/Aero_pern-structs.html" rel="nofollow noreferrer">http://gtrnadb.ucsc.edu/Aero_pern/Aero_pern-structs.html</a>)</li>
  </ol>
  
  <p>Inside that link I wish to scrap the data in the page so that I will have a long list containing this data (for example):</p>
  
  <pre><code>chr.trna3 (1-77)    Length: 77 bp
  Type: Ala   Anticodon: CGC at 35-37 (35-37) Score: 93.45
  Seq: GGGCCGGTAGCTCAGCCtGGAAGAGCGCCGCCCTCGCACGGCGGAGGcCCCGGGTTCAAATCCCGGCCGGTCCACCA
  Str: &gt;&gt;&gt;&gt;&gt;&gt;&gt;..&gt;&gt;&gt;&gt;.........&lt;&lt;&lt;&lt;.&gt;&gt;&gt;&gt;&gt;.......&lt;&lt;&lt;&lt;&lt;.....&gt;&gt;&gt;&gt;&gt;.......&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;....
  </code></pre>
  
  <p>Where each line will have it's own list (inside the list for each "trna" inside the list for each animal)</p>
  
  <p>I remember coming across the packages Rcurl and XML (in R) that can allow for such a task.  But I don't know how to use them.  So what I would love to have is:
  1. Some suggestion on how to build such a code.
  2. And recommendation for how to learn the knowledge needed for performing such a task.</p>
  
  <p>Thanks for any help,</p>
  
  <p>Tal</p>