<https://www.iphonefirmware.com/hey-ios-email-app-gets-multiwindow-support-on-ipad/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.iphonefirmware.com/hey-ios-email-app-gets-multiwindow-support-on-ipad/>