13 Aug 2007
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19 Oct 2012
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Sitefinity's Editor is an xhtml editor - meaning it'll try and strip out any non xhtml valid tags, so its not necessarily a Sitefinity bug, but more a RadEditor filter issue.
(check this thread: http://www.telerik.com/community/forums/aspnet-ajax/editor/radeditor-partially-strips-out-html5-microdata.aspx )
There is a Administration setting to set content filters from 'DefaultFilters' to something else BUT due to a Bug in Sitefinity that's not being applied. (Bug's not fixed in v5.2 as far as I'm aware)
So basically, unless you want to go out and try a code route to overcome the bug (and thus break upgrade ability) you're not going to get that working. If you'd like the code snippets, just sent me an email or hit me up on Twitter: jbokkers so I'll forward the solution to you.