The markup below is guaranteed to work with the W3C markup validation service and with ePubcheck.
<?xml version="1.0" encoding="UTF-8"?>
<!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" xml:lang="en">
You might like to consider removing whatever you have now, and replacing it with the above - and then running the file through the W3C markup service anyway.
Regards, Alex
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