About: http://webisa.webdatacommons.org/173482958

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	The code in the original letter worked OK, but as David points out there was a problem naming and identifying all the combinations and it didn't quite solve my problems.
http://www.w3.org/ns/prov#wasQuotedFrom	stata.com