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Elements Undefined when validating XHTML file

I am making a fixed layout eBook in xhtml, using Dreamweaver. I am trying to mark out a section using html5 tags: <article> and <section>. Everything looks OK, but when I try to validate it with W3C, I get the error message: element "article" undefined [XHTML 1.1]
Is it possible to use these elements with XHTML?
Is there a way to avoid these error messages?
Can you ignore these error messages with ePubs?
Jan 8 '13 #1
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