About: http://webisa.webdatacommons.org/262922121

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	Even if the source notebook is in outline format but the target cell is a heading cell that does not correspond to an item in the browser categories file, the index entry will not work.
http://www.w3.org/ns/prov#wasQuotedFrom	mathematica-journal.com