You can also add comments to an XML document. Comments go just about anywhere and are ignored  for data processing purposes. Comments are bracketed by the <!– and –> character sequences. The following listing includes three valid comments:


<?xml version=”1.0″?>


<!– This is an example . –>

<Book ISBN-13=” 978-0545139700” Title = Title>Harry Potter and the Deathly Hallows“>

<Author>J.K. Rowling</Author>




<Book ISBN-13=”978-1451648539” Title=”Steve Jobs”>

<Author>Walter Isaacson</Author>


<Available>False <!– Why isn’t available ? –> </Available>


<!– Other books omitted for clarity. –>


The only place you can’t put a comment is embedded within a start or end tag (as in <myData <!– A comment should not go here –></myData>).