<pre:MainElement xmlns:pre=“www.tempuri.org/MainSchema” xmlns:ns=“www.tempuri.org/ImportedSchema”>

<pre:MainA MainID="1"/>
<ns:AnotherElement>
  <ns:B BID="3">
    <ns:MyB>EMPTY</ns:MyB>
  </ns:B>
</ns:AnotherElement>

</pre:MainElement>