Calibre appears to have added:
Code:
<svg xmlns="http://www.w3.org/2000/svg" height="100%" preserveAspectRatio="none" version="1.1" viewBox="0 0 566 724" width="100%" xmlns:xlink="http://www.w3.org/1999/xlink">
What I don't understand is how the epub can pass the validator and then not upload to Nook as an ePub? Surely a validated ePub should work for any retailor that allows ePubs?