https://fed.skolfederation.se/prod/md/skolfederation-idp-1_0.xml skolfederation-3_1.crt
https://idp-skolverket.eduid.se/skolverket/idps.xml skolverket-huvudman-prod.crt
https://mds.swamid.se/md/swamid-registered.xml swamid.crt