About: http://webisa.webdatacommons.org/35694023

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	Buildings can be upgraded over time to make them more efficient, but certain levels of upgrades have prerequisites such as having researched a particular technology, or having upgraded other structures to a particular standard.
http://www.w3.org/ns/prov#wasQuotedFrom	adweek.com