About: http://webisa.webdatacommons.org/353007618

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 stack-based languages such as PostScript or Forth, a command which subtracts the topmost number on the stack from that beneath it, leaving the result on the top of the stack.
http://www.w3.org/ns/prov#wasQuotedFrom	everything2.com