About: http://webisa.webdatacommons.org/100598806

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 thing that you pass between them is a tile so one should return a tile and the other should accept a tile.
http://www.w3.org/ns/prov#wasQuotedFrom	gamedev.net