About: http://webisa.webdatacommons.org/131895505

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	This challenge is a message asking the sender to perform some action to prove that the message is not spam, such as to respond with a keyword.
http://www.w3.org/ns/prov#wasQuotedFrom	oreilly.com