<https://forums.slipstick.com/threads/8408-opening-email-from-a-share-breaks-add-in/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://forums.slipstick.com/threads/8408-opening-email-from-a-share-breaks-add-in/#post-26147>