Hi all, In my attempt to use Humboldt Extension to infer non-detection, I arrived at this question because it is not clear to me how to use null in the following situation. Should eco:isTaxonomicScopeFullyReported (previously eco:isTaxonomicScopeComplete) be "true", "false" or null if an dwc:Event do not catch anything within the eco:targetTaxonomicScope and eco:isAbsenceReported == "false"? I illustrate my understanding in the table below: * assume that all the catch are reported in the Occurrence extension eventID catch eventRemarks targetTaxonomicScope (taxa are pipe-separated) isAbsenceReported isTaxonomicScopeFullyReported can infer non-detection of taxa within targetTaxonomicScope? event_001 A A | B false true true event_002 A A | B false false false event_003 A, C A | B false true true event_004 by-catch only A | B false true true event_005 by-catch only A | B false false false event_006 by-catch only A | B false false event_007 caught nothing A | B false true true event_008 caught nothing A | B false false false event_009 caught nothing A | B false false How can I distinguish: * an dwc:Event caught by-catch only, but did not report it (no dwc:Occurrence record associates with the dwc:Event) * an dwc:Event caught nothing at all Is this distinction important? Can someone with ecology or relevant background please comment? @Rob Stevenson<mailto:rdstevenson10@gmail.com> maybe? Thanks a lot! Cheers Ming