&gt; I&#x27;ll take marks off for 2011 being too early, but not for the datatype choice.<p>I would.  If he had said something like &quot;XML is most popular... but really meant for documents not data, so something similar will probably replace XML&quot; then I would have given full marks, even if he didn&#x27;t specify JSON or BSON explicitly.<p>(I would give ~50% though, not 20%)