About: http://webisa.webdatacommons.org/70716268

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	Portal is the cleanest and smallest of the games running on the Source engine, as there is minimal scripting and it is the easiest base for Valve to start from, as it already has all of HL2's textures and models.
http://www.w3.org/ns/prov#wasQuotedFrom	steampowered.com