About: http://webisa.webdatacommons.org/232226358

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	So, if it was adjusted and if $index was an observable, then if a binding does use it, it would get re-evaluated on a change.
http://www.w3.org/ns/prov#wasQuotedFrom	github.com