<https://w3schools.invisionzone.com/topic/21304-how-to-create-chatting-window/#comment-118401>
<http://schema.org/upvoteCount>
"0"^^<http://www.w3.org/2001/XMLSchema#integer>
<https://w3schools.invisionzone.com/topic/21304-how-to-create-chatting-window/?tab=comments#comment-118434>