About: http://webisa.webdatacommons.org/45303073

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	However, some types of messages, particularly acknowledgements of receipt of earlier messages, may just be identified as such by the message type and routing information section and carry no payload data.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com