The XMLHTTPRequest object allows for asynchronous data
retrieval from web servers. The data format is typically XML, but it works
well with any text-based data. The XMLHTTPRequest object is also a
not get into the details of AJAX, but for a quick overview I recommend reading this article.
RSS feeds are documents that adhere to a pre-defined XML
structure. Since InfoPath is based entirely on XML technology, we can use the XMLHTTPRequest
object to retrieve XML documents like RSS feeds and apply an XSL transformation
to transform the XML data into a format that can be loaded and displayed in an InfoPath