About: http://webisa.webdatacommons.org/123214320

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	sudo apt-get install libpq-dev A different article says to manually install the pg gem but I did not do that. (Well, I don???t think I did; there was a lot of trial and error in working this out.) However the gem is in my Gemfile.
http://www.w3.org/ns/prov#wasQuotedFrom	mcbsys.com