About: http://webisa.webdatacommons.org/272113937

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	This RFC proposes to lift the restriction and allow values of arbitrary types to be used as keys (in particularly allowing also arrays and objects) in iterators. (Note: This proposal does not suggest allowing those key types in arrays.
http://www.w3.org/ns/prov#wasQuotedFrom	php.net