<http://webisa.webdatacommons.org/257341790> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> . <http://webisa.webdatacommons.org/prov/63681885> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/257341790> . <http://webisa.webdatacommons.org/257341790> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/257341790> <http://www.w3.org/ns/prov#value> "Web server 108 may request authentication, such as a username and password, from web browser 104." .