About: http://webisa.webdatacommons.org/429234344

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	List of the Presidents of Poland (officially President of the Republic of Poland) and other Polish heads of state since 1918 (people who held title other than President)
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org