About: http://webisa.webdatacommons.org/396853625

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	Therefore after drawing a shape, canvas does not remember and if you want to make changes you have to draw the whole shape again.There are a few Javascript scene graph libraries such as CAKE that could solve this problem.
http://www.w3.org/ns/prov#wasQuotedFrom	portfour.com