About: http://webisa.webdatacommons.org/209144598

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 buttons are automatically alpha-blended (anti-aliased) with the background to create nice smooth edges, and provide region clipping to create various elliptical and other shapes.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com