title: Select node with unique id using XSLT
body: <p>How can I select a specific node with an unique ID and return the entire node as xml. </p>
  
  <pre><code>&lt;xml&gt;
  &lt;library&gt;
  &lt;book id='1'&gt;
  &lt;title&gt;firstTitle&lt;/title&gt;
  &lt;author&gt;firstAuthor&lt;/author&gt;
  &lt;/book&gt;
  &lt;book id='2'&gt;
  &lt;title&gt;secondTitle&lt;/title&gt;
  &lt;author&gt;secondAuthor&lt;/author&gt;
  &lt;/book&gt;
  &lt;book id='3'&gt;
  &lt;title&gt;thirdTitle&lt;/title&gt;
  &lt;author&gt;thirdAuthor&lt;/author&gt;
  &lt;/book&gt;
  &lt;/library&gt;
  &lt;/xml&gt;
  </code></pre>
  
  <p>In this case I would like to return book with id='3', so it will look something like this:</p>
  
  <pre><code>&lt;book id='3'&gt;
  &lt;title&gt;thirdTitle&lt;/title&gt;
  &lt;author&gt;thirdAuthor&lt;/author&gt;
  &lt;/book&gt;
  </code></pre>