<https://www.lifehack.org/articles/featured/four-kinds-of-vampires-that-haunt-your-life-and-what-to-do-about-them.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.lifehack.org/articles/productivity/four-kinds-of-vampires-that-haunt-your-life-and-what-to-do-about-them.html>