<https://larryullman.com/forums/index.php?/topic/442-iconscolors-after-checkboxoption-i-choosen/#comment-2692>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://larryullman.com/forums/index.php?/topic/442-iconscolors-after-checkboxoption-i-choosen/&tab=comments#comment-2714>