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[edited by: bill at 8:45 am (utc) on Sep. 14, 2009]
[edit reason] tidy up [/edit]
See the RSS 2.0 spec [cyber.law.harvard.edu]
RSS is a dialect of XML. All RSS files must conform to the XML 1.0 specification, as published on the World Wide Web Consortium (W3C) website.
So simply put, no.