About: http://webisa.webdatacommons.org/140434126

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	One way is to do : Associate each of the 3 buttons Bi to their respective window Wi (like a map where a key is a button and the value the QMainWindow)
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com