About: http://webisa.webdatacommons.org/114844485

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	NaN exists for the sole purpose of propagating the improperness" of a calculation result up the chain to where it can be intelligently handled, somewhat similar to exceptions in D, Java, and other languages.
http://www.w3.org/ns/prov#wasQuotedFrom	digitalmars.com