ruby-hacking-guide/ruby-hacking-guide.github.com — pull request #31 by avsej (2013-10-03 06:30:29+00:00)
Title: Add XHTML namespace for epub contents

O'Reilly guides say that it will make it more iBooks friendly
http://my.safaribooksonline.com/book/-/9781449320065/html5-for-publishers/id2481317