Please stop calling an RSS feed an XML feed. XML refers to the document type, while RSS is a subset of XML. RSS is XML, but XML is not RSS. The orange “XML” buttons that you see everywhere on the Web make sense, so long as you understand the relationship between RSS and XML. However, most people don't – and they wind up calling their RSS feed an XML feed. Why? Because I don't think anybody has bothered to explain it yet. Again, it's not an XML feed if you're talking about RSS. Yes, it's an XML document, but it's an RSS feed. Now you know.
And knowing is half the battle.