<https://boards.bordercollie.org/topic/27589-how-to-teach-a-dog-to-come-off-an-object/#comment-342647>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://boards.bordercollie.org/topic/27589-how-to-teach-a-dog-to-come-off-an-object/>