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5.2 of http://dev.w3.org/html5/html-xhtml-author-guide/WD-html-polyglot-20101019.htm says before using the xlink prefix for the following elements: followed by a list of attributes such as xlink:href. I assume "following elements" is a typo for "following attributes"
Yes, that is a typo. Fixed in the 29 October editor's draft. Thanks for the feedback, Eliot
mass-move component to LC1