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Sledmore, this is what I code in. XHTML 1.0
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
It states information about the coding language. For example that one means that the page is coded in HTML 4.
EDIT: Pudding you don't need to write that for HTML to work. It's just invalid.