About: http://webisa.webdatacommons.org/37974227

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 original Source engine made its debut with Counter-Strike: Source, and was used to develop games such as Half-Life 2 and Left 4 Dead.
http://www.w3.org/ns/prov#wasQuotedFrom	siliconera.com