#482: Schematron: add test restricting count of dsc to 1
#482: Schematron: add test restricting count of dsc to 1

SAA-SDT/EAD3,informaticmonad/EAD3,SAA-SDT/EAD-Revision,informaticmonad/EAD3,SAA-SDT/EAD3,SAA-SDT/EAD-Revision