Open the xml file in notepad and simply replace the lines (or even better, insert the lines in your xsd).
Download an XML editor and modify the name of NewsItemRow element in definition, meaning the change will be applied on the whole document (NewsItemTable can be amended similarly or as described above, in notepad, since those are only two lines).
Technically, you should be able to use Product and Producs in the xsd file, but it somehow doesn't work with the definition from http://bitwizards.com/blog/november-...rksheet-to-xml. I have an xsd at my workplace with which it works, but I don't have access to it right now. If you google other definitions, you will surely come across a solution. As I said above though, you can amend it in every XML editor as well.
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