About: http://webisa.webdatacommons.org/15581523

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	That is, test for everything except Y, and then return DIRECTEDGE if no match is found.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com