urn:ddi:de.dezim:21ed2882-c563-4d5e-96f5-d759a03c351a:2 de.dezim 21ed2882-c563-4d5e-96f5-d759a03c351a 2 extension:ShouldCalculateFrequenciesForValidValues False extension:ShouldCalculateFrequenciesForInvalidValues False shk@dezim-institut.de ipl_discussion startdate startdate startdate Startdatum Start Date Start Date