About: http://webisa.webdatacommons.org/40697942

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 your code, ptr is a pointer and so you cannot find out the length of the array to which it points.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com