.blend to .xml?

Hello, I am new to Blender, I am learning fairly quickly to. My question is…well first, I have created a vehicle base and I want to save/export it. I want to save/export it as an .xml. .Xml is used in a virtual world called Second Life. I am using Blender 2.47 (because its basic and better for me to use) and when I look in File>Export I do not see the possibility. So now my question: Am I missing it? Is there a file converter I can use? If you have any answer/question about my question, please reply asap as it would be greatly appreciated. Thanks in advance.