About: http://webisa.webdatacommons.org/432309673

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	If x is a vector, matrix or data frame then x[is.na(x)] <- 0 will replace all missing values with 0.
http://www.w3.org/ns/prov#wasQuotedFrom	had.co.nz