About: http://webisa.webdatacommons.org/77748595

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	For your example conditional where you want to change what you do based on the Head of the resulting expression, you can use Switch, such as in:
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com