> example :: VoiceTwiml
> example =
>   response $ do
>     enqueue "support" $ def & waitURL .~ parseURL "wait-music.xml"
>     end
>   where Twiml.Syntax{..} = def

>>> show example
<?xml version="1.0" encoding="UTF-8"?>
<Response>
  <Enqueue waitUrl="wait-music.xml">support</Enqueue>
</Response>