About: http://webisa.webdatacommons.org/423923196

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	We can do this by passing an option to the call to tracked in the Comment model: either only to specify which activities should be tracked or except to specify the ones to exclude. /app/models/comment.rb
http://www.w3.org/ns/prov#wasQuotedFrom	railscasts.com