About: http://webisa.webdatacommons.org/439082482

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	As said in the article, there is a utility to import tags from that and other popular tagging Plugins into the new native tagging system, converting the tags for each post but losing the features that made UTW so wonderful.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com