<https://community.secondlife.com/forums/topic/473147-most-efficient-way-to-advertise-legitimately/#comment-2306760>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://community.secondlife.com/forums/topic/473147-most-efficient-way-to-advertise-legitimately/?tab=comments#comment-2306760>