I'm using a dataStore with an xmlreader, however the javascript is crashing whenever I load Yahoo!'s RSS News feed, apparently the problem is that Yahoo includes an HTML comment at the end of there rss feed with a timestamp. The specific javascript error is as follows

no element found

<!-- rc2.ops.bf1.yahoo.com uncompressed/chunked Tue Aug 21 17:14:17 UTC 2012 ---^

Any ideas on how to avoid extjs having issues with comments in an xml feed?