About: http://webisa.webdatacommons.org/382591114

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	In other words, when it is an exceptional if the sequence is empty.Use FirstOrDefault, when you know that you will need to check whether there was an element or not.
http://www.w3.org/ns/prov#wasQuotedFrom	programminginterviews.info