About: http://webisa.webdatacommons.org/403531817

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	So I am not sure what your options are other than to manually composite your K1, K2 pairs into a separate column, which is par
http://www.w3.org/ns/prov#wasQuotedFrom	apache.org