Q:

Why is my XPath using following-sibling not working?

I need to select the next input field and the A field, following the active page (class="active_page") on the two sample HTML code below, but the following two XPath are not working. 
How would I accomplish the following-sibling and what is the easiest way of doing this?
//*[@id="pagination"]/ul/li[2]/a/following-sibling::A[1]

<div id="pagination">
   <ul class="zPagination">
      <li><a href="https://www.test.com/page&pagination=10">«</a></li>
      <li><a class="active_page" href="https://www.test.com/page&pagination=10">1</a></li>
      <li><a href="https://www.test.com/page&pagination=10">2</a></li>
      <li><a href="https://www.test.com/page&pagination=10">3</a></li>
      <li><a href="https://www.test.com/page&pagination=10">»</a></li>
   </ul>
</div>

//TABLE[@class='table-striped']/TBODY[1]/TR[1]/TD[1]/INPUT[1]/following-sibling::INPUT[1]

<table class="table-striped">
   <tbody>
      <tr>
         <td><input id="selection" style="width: 20px;" name="test" class="zeroborder" value="001" type="radio"> </td>
         <td>S</td>
      </tr>
      <tr>
         <td><input id="selection" style="width: 20px;" name="test" class="zeroborder" value="002" type="radio"> </td>
         <td>S</td>
      </tr>
      <tr>
         <td><input id="selection" style="width: 20px;" name="test" class="zeroborder" value="003" type="radio"> </td>
         <td>S</td>
      </tr>
   </tbody>
</table>

A:

There are (at least) two errors with your XPaths:

XPath and XML are case sensitive.
There are no following-siblings a or input elements.  Perhaps 
you meant just following.

