<https://secure.gravatar.com/avatar/fe863f1798cddb51c00b2c270af03628?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.adsalsa.com/en/3-essential-contents-in-email-marketing/>