XenForo has an HTML5 doctype, so such things are allowed.
XHTML is extensible if you have a doctype suited to it. You can roll your own doctype with DTDs if you want to include the extra details, but it's not recommended.
XHTML 1.0 Transitional is a standard; it cannot be arbitrarily extended and still called XHTML 1.0 Transitional...
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