<http://www.flytyingforum.com/index.php?/topic/68539-tying-with-bifocals/#comment-513657>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.flytyingforum.com/index.php?/topic/68539-tying-with-bifocals/&tab=comments#comment-513629>