About: http://webisa.webdatacommons.org/66505395

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	Imagine that your columns include numbers, strings, and factors; then a row of that dataframe is not a vector (because vectors must be all of one type, i.e. all numbers or all factors), but rather a list.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com