If XML file is too big for AJAX

http://www.developer.com/lang/php/article.php/3897851/article.htm

I found this article which is quite useful. What will you do if XML file is too big.

1. Transform the XML documents into a character string.
2. Split the character string into equal chunks (400 characters).
3. Save each chunk as a value in an array.
4. Transfer the chunks one by one using the Ajax mechanism into the final XML document.