<https://secure.gravatar.com/avatar/4e0e96ef11a3845aa337d7e99197ec65?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://quicktroubleshooting.com/types-of-sewing-machines-2/>