Frameset Doctypes are not for actual document.
They are only for Framesets like:
which defines which documents to display in the window and how to arrange them.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
@Feinburgrl: Don't instruct a coder, that are so noob, that they do not know the difference between doctypes, to use xHtml.
It is too advanced at their level.