About: http://webisa.webdatacommons.org/212148330

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	This does not explain why only certain keys fire the event but it should be noted that you need to check event.E.Action to find out whether the press or release is currently triggering the event.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com