About: http://webisa.webdatacommons.org/28046251

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	Specifically, birch and pine trees must have 2 blocks of empty-or-filled-with-leaves space between their trunk and any other tree trunk or wall.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com