Instructions for porting to XHTML v1.1:

In Code view, Right click and Optimize HTML, Reformat HTML, then Apply XML Formatting Rules

Replace top with following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

Run Compatibility Report and fix errors before saving. May need to regress to HTML 4.0 for older pages