About: http://webisa.webdatacommons.org/135532959

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	The desperation for water treatment became essential during the Middle Ages, when empires, for example the Roman Empire, lacked water supply.
http://www.w3.org/ns/prov#wasQuotedFrom	dipity.com