<Octothorpe xmlns:A="uri:type:A" xmlns:B="uri:type:B" xmlns:X="uri:type:X">
  <colon/>
  <question_mark>
    <aiieee crash="bang_eth">rip<A:swish glipp="bap" B:ker_plop="owww" X:clank="ouch" /></aiieee>
  </question_mark>
</Octothorpe>