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It had the attribute xmlns="http://www.w3.org/1999/xhtml" in the html tag. Replacing that attribute with the suggested one seems to fix the problem.
I have another epub where the landmarks section has:
<nav xmlns:epub="http://www.idpf.org/2007/ops" epub:type="landmarks" hidden="">
and
<html> has xmlns="http://www.w3.org/1999/xhtml"
which does not throw the error.
Anyway error resolved and understanding increased.
--MH
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