About: http://webisa.webdatacommons.org/58287011

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	If efficiency is a concern, you could cast the a_copy to a const string to force the const version of operator[] to be used, which will not make a copy of the internal buffer.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com