About: http://webisa.webdatacommons.org/374575403

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	As you pointed out, often the specifics of what constitutes invalid request parameters is different enough for each view, and so including this type of code in each view is (I think) fine and not a DRY violation.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com