About: http://webisa.webdatacommons.org/178239737

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	The signal can be generated by the user when a key is pressed, from hardware such as a monitor when a vertical retrace occurs, or even from the operating system when something such as a page fault happens during memory allocation.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.com