<http://webisa.webdatacommons.org/prov/422276920> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/292105132> . <http://webisa.webdatacommons.org/292105132> <http://www.w3.org/ns/prov#wasQuotedFrom> <stackoverflow.com> . <http://webisa.webdatacommons.org/292105132> <http://www.w3.org/ns/prov#value> "I need to create a predicate for searches but the user has the option to enter any possible combination of all three attributes e.g. one search is on studyID and studyDate but not studyName while the next search is just on studyID." . <http://webisa.webdatacommons.org/292105132> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .