About: http://webisa.webdatacommons.org/132338678

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	Thus, you can use obj.respond_to?(:to_str) instead of something like obj.is_a?(String) if you want to take advantage of duck typing without worrying about whether the class you are working with is a subclass of String or not.
http://www.w3.org/ns/prov#wasQuotedFrom	briancarper.net