About: http://webisa.webdatacommons.org/442147902

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	Yes you can add additional data to the postdata using onclickSubmit event under del parameters of navgrid, In your case if you want to send user_id including id, than do something like this
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com