About: http://webisa.webdatacommons.org/428650794

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	So, every forms should be closed except mainform when user clicks on the button placed on the form2 or form3.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com