In my existing web page layout, which involves multiple files, one specifying the high-level layout, there are two elements, one for a left column, and one for a right colu
(Sorry to unaccept an answer and post my own, but I just found out apparently the answers I got are not up to date with HTML5!)
HTML5 introduces a form= attribute for element [1]. So that you can do and have it in a nested inner form, or even outside of the` element.
[1] http://www.w3.org/TR/html5/association-of-controls-and-forms.html#attr-fae-form