<https://blog.jancevela.cz/#/schema/person/image/>
<http://schema.org/url>
<https://secure.gravatar.com/avatar/f94f1333f05bb0d1a4667b7c9bdbe569?s=96&d=mm&r=g>
<https://blog.jancevela.cz/2013/03/ach-ta-zima#comment-355>